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Finding the Fourth Proportional to 453.38, 624.92 and 390.87

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Solution

The fourth proportional to 453.38, 624.92 and 390.87 is: 538.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    453.38 : 624.92 = 390.87 : x
  2. Step 2: Convert to fraction form
    453.38/624.92 = 390.87/x
  3. Step 3: Cross multiply
    453.38x = 624.92 × 390.87
  4. Step 4: Simplify right side
    453.38x = 244,260.53
  5. Step 5: Solve for x
    x = 244,260.53/453.38
  6. Step 6: Final answer
    x = 538.76

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.