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Finding the Fourth Proportional to 715,744.86, 987,731.10 and 393,475.68

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Solution

The fourth proportional to 715,744.86, 987,731.10 and 393,475.68 is: 542,998.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,744.86 : 987,731.10 = 393,475.68 : x
  2. Step 2: Convert to fraction form
    715,744.86/987,731.10 = 393,475.68/x
  3. Step 3: Cross multiply
    715,744.86x = 987,731.10 × 393,475.68
  4. Step 4: Simplify right side
    715,744.86x = 388,648,166,229.65
  5. Step 5: Solve for x
    x = 388,648,166,229.65/715,744.86
  6. Step 6: Final answer
    x = 542,998.19

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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.