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Finding the Fourth Proportional to 621.43, 932.31 and 553.42

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Solution

The fourth proportional to 621.43, 932.31 and 553.42 is: 830.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.43 : 932.31 = 553.42 : x
  2. Step 2: Convert to fraction form
    621.43/932.31 = 553.42/x
  3. Step 3: Cross multiply
    621.43x = 932.31 × 553.42
  4. Step 4: Simplify right side
    621.43x = 515,960.17
  5. Step 5: Solve for x
    x = 515,960.17/621.43
  6. Step 6: Final answer
    x = 830.28

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Double scale
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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.