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Finding the Fourth Proportional to 636,985.80, 955,478.70 and 437,920.20

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Solution

The fourth proportional to 636,985.80, 955,478.70 and 437,920.20 is: 656,880.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    636,985.80 : 955,478.70 = 437,920.20 : x
  2. Step 2: Convert to fraction form
    636,985.80/955,478.70 = 437,920.20/x
  3. Step 3: Cross multiply
    636,985.80x = 955,478.70 × 437,920.20
  4. Step 4: Simplify right side
    636,985.80x = 418,423,423,399.74
  5. Step 5: Solve for x
    x = 418,423,423,399.74/636,985.80
  6. Step 6: Final answer
    x = 656,880.30

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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.