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Finding the Fourth Proportional to 39.91, 55.15 and 32.47

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Solution

The fourth proportional to 39.91, 55.15 and 32.47 is: 44.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.91 : 55.15 = 32.47 : x
  2. Step 2: Convert to fraction form
    39.91/55.15 = 32.47/x
  3. Step 3: Cross multiply
    39.91x = 55.15 × 32.47
  4. Step 4: Simplify right side
    39.91x = 1,790.72
  5. Step 5: Solve for x
    x = 1,790.72/39.91
  6. Step 6: Final answer
    x = 44.87

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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.