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Finding the Fourth Proportional to 621.78, 932.89 and 448.64

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Solution

The fourth proportional to 621.78, 932.89 and 448.64 is: 673.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.78 : 932.89 = 448.64 : x
  2. Step 2: Convert to fraction form
    621.78/932.89 = 448.64/x
  3. Step 3: Cross multiply
    621.78x = 932.89 × 448.64
  4. Step 4: Simplify right side
    621.78x = 418,531.77
  5. Step 5: Solve for x
    x = 418,531.77/621.78
  6. Step 6: Final answer
    x = 673.12

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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.