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Finding the Fourth Proportional to 715,385.50, 987,231.72 and 393,116.36

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Solution

The fourth proportional to 715,385.50, 987,231.72 and 393,116.36 is: 542,500.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,385.50 : 987,231.72 = 393,116.36 : x
  2. Step 2: Convert to fraction form
    715,385.50/987,231.72 = 393,116.36/x
  3. Step 3: Cross multiply
    715,385.50x = 987,231.72 × 393,116.36
  4. Step 4: Simplify right side
    715,385.50x = 388,096,940,242.94
  5. Step 5: Solve for x
    x = 388,096,940,242.94/715,385.50
  6. Step 6: Final answer
    x = 542,500.43

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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 (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.