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Finding the Fourth Proportional to 621.48, 932.11 and 438.31

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Solution

The fourth proportional to 621.48, 932.11 and 438.31 is: 657.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.48 : 932.11 = 438.31 : x
  2. Step 2: Convert to fraction form
    621.48/932.11 = 438.31/x
  3. Step 3: Cross multiply
    621.48x = 932.11 × 438.31
  4. Step 4: Simplify right side
    621.48x = 408,549.71
  5. Step 5: Solve for x
    x = 408,549.71/621.48
  6. Step 6: Final answer
    x = 657.38

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.