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Finding the Fourth Proportional to 38.53, 57.45 and 31.71

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Solution

The fourth proportional to 38.53, 57.45 and 31.71 is: 47.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    38.53 : 57.45 = 31.71 : x
  2. Step 2: Convert to fraction form
    38.53/57.45 = 31.71/x
  3. Step 3: Cross multiply
    38.53x = 57.45 × 31.71
  4. Step 4: Simplify right side
    38.53x = 1,821.74
  5. Step 5: Solve for x
    x = 1,821.74/38.53
  6. Step 6: Final answer
    x = 47.28

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.