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Finding the Fourth Proportional to 42.54, 63.89 and 31.17

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Solution

The fourth proportional to 42.54, 63.89 and 31.17 is: 46.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.54 : 63.89 = 31.17 : x
  2. Step 2: Convert to fraction form
    42.54/63.89 = 31.17/x
  3. Step 3: Cross multiply
    42.54x = 63.89 × 31.17
  4. Step 4: Simplify right side
    42.54x = 1,991.30
  5. Step 5: Solve for x
    x = 1,991.30/42.54
  6. Step 6: Final answer
    x = 46.81

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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.