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Finding the Fourth Proportional to 38.97, 53.79 and 31.71

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Solution

The fourth proportional to 38.97, 53.79 and 31.71 is: 43.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    38.97 : 53.79 = 31.71 : x
  2. Step 2: Convert to fraction form
    38.97/53.79 = 31.71/x
  3. Step 3: Cross multiply
    38.97x = 53.79 × 31.71
  4. Step 4: Simplify right side
    38.97x = 1,705.68
  5. Step 5: Solve for x
    x = 1,705.68/38.97
  6. Step 6: Final answer
    x = 43.77

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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.