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Finding the Fourth Proportional to 86.92, 119.70 and 66.12

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Solution

The fourth proportional to 86.92, 119.70 and 66.12 is: 91.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.92 : 119.70 = 66.12 : x
  2. Step 2: Convert to fraction form
    86.92/119.70 = 66.12/x
  3. Step 3: Cross multiply
    86.92x = 119.70 × 66.12
  4. Step 4: Simplify right side
    86.92x = 7,914.56
  5. Step 5: Solve for x
    x = 7,914.56/86.92
  6. Step 6: Final answer
    x = 91.06

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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.