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Finding the Fourth Proportional to 71.71, 107.48 and 31.17

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Solution

The fourth proportional to 71.71, 107.48 and 31.17 is: 46.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.71 : 107.48 = 31.17 : x
  2. Step 2: Convert to fraction form
    71.71/107.48 = 31.17/x
  3. Step 3: Cross multiply
    71.71x = 107.48 × 31.17
  4. Step 4: Simplify right side
    71.71x = 3,349.46
  5. Step 5: Solve for x
    x = 3,349.46/71.71
  6. Step 6: Final answer
    x = 46.71

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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.