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Finding the Fourth Proportional to 67.71, 101.49 and 31.56

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Solution

The fourth proportional to 67.71, 101.49 and 31.56 is: 47.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.71 : 101.49 = 31.56 : x
  2. Step 2: Convert to fraction form
    67.71/101.49 = 31.56/x
  3. Step 3: Cross multiply
    67.71x = 101.49 × 31.56
  4. Step 4: Simplify right side
    67.71x = 3,203.02
  5. Step 5: Solve for x
    x = 3,203.02/67.71
  6. Step 6: Final answer
    x = 47.31

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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.