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Finding the Fourth Proportional to 749.38, 1,123.71 and 424.66

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Solution

The fourth proportional to 749.38, 1,123.71 and 424.66 is: 636.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.38 : 1,123.71 = 424.66 : x
  2. Step 2: Convert to fraction form
    749.38/1,123.71 = 424.66/x
  3. Step 3: Cross multiply
    749.38x = 1,123.71 × 424.66
  4. Step 4: Simplify right side
    749.38x = 477,194.69
  5. Step 5: Solve for x
    x = 477,194.69/749.38
  6. Step 6: Final answer
    x = 636.79

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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.