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Finding the Fourth Proportional to 101.27, 139.56 and 72.11

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Solution

The fourth proportional to 101.27, 139.56 and 72.11 is: 99.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.27 : 139.56 = 72.11 : x
  2. Step 2: Convert to fraction form
    101.27/139.56 = 72.11/x
  3. Step 3: Cross multiply
    101.27x = 139.56 × 72.11
  4. Step 4: Simplify right side
    101.27x = 10,063.84
  5. Step 5: Solve for x
    x = 10,063.84/101.27
  6. Step 6: Final answer
    x = 99.37

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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.