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Finding the Fourth Proportional to 86.92, 129.63 and 76.14

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Solution

The fourth proportional to 86.92, 129.63 and 76.14 is: 113.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.92 : 129.63 = 76.14 : x
  2. Step 2: Convert to fraction form
    86.92/129.63 = 76.14/x
  3. Step 3: Cross multiply
    86.92x = 129.63 × 76.14
  4. Step 4: Simplify right side
    86.92x = 9,869.67
  5. Step 5: Solve for x
    x = 9,869.67/86.92
  6. Step 6: Final answer
    x = 113.54

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.