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Finding the Fourth Proportional to 925.52, 1,387.90 and 438.72

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Solution

The fourth proportional to 925.52, 1,387.90 and 438.72 is: 657.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    925.52 : 1,387.90 = 438.72 : x
  2. Step 2: Convert to fraction form
    925.52/1,387.90 = 438.72/x
  3. Step 3: Cross multiply
    925.52x = 1,387.90 × 438.72
  4. Step 4: Simplify right side
    925.52x = 608,899.49
  5. Step 5: Solve for x
    x = 608,899.49/925.52
  6. Step 6: Final answer
    x = 657.90

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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.