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Finding the Fourth Proportional to 647,621.40, 971,432.10 and 411,425.40

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Solution

The fourth proportional to 647,621.40, 971,432.10 and 411,425.40 is: 617,138.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    647,621.40 : 971,432.10 = 411,425.40 : x
  2. Step 2: Convert to fraction form
    647,621.40/971,432.10 = 411,425.40/x
  3. Step 3: Cross multiply
    647,621.40x = 971,432.10 × 411,425.40
  4. Step 4: Simplify right side
    647,621.40x = 399,671,840,315.34
  5. Step 5: Solve for x
    x = 399,671,840,315.34/647,621.40
  6. Step 6: Final answer
    x = 617,138.10

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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.