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Finding the Fourth Proportional to 101.71, 140.39 and 72.69

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Solution

The fourth proportional to 101.71, 140.39 and 72.69 is: 100.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.71 : 140.39 = 72.69 : x
  2. Step 2: Convert to fraction form
    101.71/140.39 = 72.69/x
  3. Step 3: Cross multiply
    101.71x = 140.39 × 72.69
  4. Step 4: Simplify right side
    101.71x = 10,204.95
  5. Step 5: Solve for x
    x = 10,204.95/101.71
  6. Step 6: Final answer
    x = 100.33

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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.