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Finding the Fourth Proportional to 101.15, 139.59 and 71.68

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Solution

The fourth proportional to 101.15, 139.59 and 71.68 is: 98.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.15 : 139.59 = 71.68 : x
  2. Step 2: Convert to fraction form
    101.15/139.59 = 71.68/x
  3. Step 3: Cross multiply
    101.15x = 139.59 × 71.68
  4. Step 4: Simplify right side
    101.15x = 10,005.34
  5. Step 5: Solve for x
    x = 10,005.34/101.15
  6. Step 6: Final answer
    x = 98.92

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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.