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Finding the Fourth Proportional to 715,720.24, 987,706.20 and 393,443.92

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Solution

The fourth proportional to 715,720.24, 987,706.20 and 393,443.92 is: 542,959.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,720.24 : 987,706.20 = 393,443.92 : x
  2. Step 2: Convert to fraction form
    715,720.24/987,706.20 = 393,443.92/x
  3. Step 3: Cross multiply
    715,720.24x = 987,706.20 × 393,443.92
  4. Step 4: Simplify right side
    715,720.24x = 388,606,999,136.30
  5. Step 5: Solve for x
    x = 388,606,999,136.30/715,720.24
  6. Step 6: Final answer
    x = 542,959.35

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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.