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Finding the Fourth Proportional to 647,408,028.80, 971,112,043.20 and 636,658,486.40

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Solution

The fourth proportional to 647,408,028.80, 971,112,043.20 and 636,658,486.40 is: 954,987,729.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    647,408,028.80 : 971,112,043.20 = 636,658,486.40 : x
  2. Step 2: Convert to fraction form
    647,408,028.80/971,112,043.20 = 636,658,486.40/x
  3. Step 3: Cross multiply
    647,408,028.80x = 971,112,043.20 × 636,658,486.40
  4. Step 4: Simplify right side
    647,408,028.80x = 618,266,723,548,523,392
  5. Step 5: Solve for x
    x = 618,266,723,548,523,392/647,408,028.80
  6. Step 6: Final answer
    x = 954,987,729.60

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.