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Finding the Fourth Proportional to 647,709.40, 971,564.10 and 490,245.40

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Solution

The fourth proportional to 647,709.40, 971,564.10 and 490,245.40 is: 735,368.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    647,709.40 : 971,564.10 = 490,245.40 : x
  2. Step 2: Convert to fraction form
    647,709.40/971,564.10 = 490,245.40/x
  3. Step 3: Cross multiply
    647,709.40x = 971,564.10 × 490,245.40
  4. Step 4: Simplify right side
    647,709.40x = 476,304,830,830.14
  5. Step 5: Solve for x
    x = 476,304,830,830.14/647,709.40
  6. Step 6: Final answer
    x = 735,368.10

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Half scale
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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.