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Finding the Fourth Proportional to 715,517.78, 987,438.21 and 393,239.30

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Solution

The fourth proportional to 715,517.78, 987,438.21 and 393,239.30 is: 542,683.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,517.78 : 987,438.21 = 393,239.30 : x
  2. Step 2: Convert to fraction form
    715,517.78/987,438.21 = 393,239.30/x
  3. Step 3: Cross multiply
    715,517.78x = 987,438.21 × 393,239.30
  4. Step 4: Simplify right side
    715,517.78x = 388,299,510,493.65
  5. Step 5: Solve for x
    x = 388,299,510,493.65/715,517.78
  6. Step 6: Final answer
    x = 542,683.24

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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.