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Finding the Fourth Proportional to 715,920.56, 987,972.90 and 393,650.92

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Solution

The fourth proportional to 715,920.56, 987,972.90 and 393,650.92 is: 543,239.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,920.56 : 987,972.90 = 393,650.92 : x
  2. Step 2: Convert to fraction form
    715,920.56/987,972.90 = 393,650.92/x
  3. Step 3: Cross multiply
    715,920.56x = 987,972.90 × 393,650.92
  4. Step 4: Simplify right side
    715,920.56x = 388,916,441,020.07
  5. Step 5: Solve for x
    x = 388,916,441,020.07/715,920.56
  6. Step 6: Final answer
    x = 543,239.66

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Double scale
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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.