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Finding the Fourth Proportional to 38.91, 53.77 and 31.47

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Solution

The fourth proportional to 38.91, 53.77 and 31.47 is: 43.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    38.91 : 53.77 = 31.47 : x
  2. Step 2: Convert to fraction form
    38.91/53.77 = 31.47/x
  3. Step 3: Cross multiply
    38.91x = 53.77 × 31.47
  4. Step 4: Simplify right side
    38.91x = 1,691.85
  5. Step 5: Solve for x
    x = 1,691.85/38.91
  6. Step 6: Final answer
    x = 43.48

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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.