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Finding the Fourth Proportional to 86.68, 129.38 and 75.82

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Solution

The fourth proportional to 86.68, 129.38 and 75.82 is: 113.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.68 : 129.38 = 75.82 : x
  2. Step 2: Convert to fraction form
    86.68/129.38 = 75.82/x
  3. Step 3: Cross multiply
    86.68x = 129.38 × 75.82
  4. Step 4: Simplify right side
    86.68x = 9,809.59
  5. Step 5: Solve for x
    x = 9,809.59/86.68
  6. Step 6: Final answer
    x = 113.17

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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.