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Finding the Fourth Proportional to 621.78, 932.28 and 378.36

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Solution

The fourth proportional to 621.78, 932.28 and 378.36 is: 567.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.78 : 932.28 = 378.36 : x
  2. Step 2: Convert to fraction form
    621.78/932.28 = 378.36/x
  3. Step 3: Cross multiply
    621.78x = 932.28 × 378.36
  4. Step 4: Simplify right side
    621.78x = 352,737.46
  5. Step 5: Solve for x
    x = 352,737.46/621.78
  6. Step 6: Final answer
    x = 567.30

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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.