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Finding the Fourth Proportional to 87.08, 119.98 and 66.31

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Solution

The fourth proportional to 87.08, 119.98 and 66.31 is: 91.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.08 : 119.98 = 66.31 : x
  2. Step 2: Convert to fraction form
    87.08/119.98 = 66.31/x
  3. Step 3: Cross multiply
    87.08x = 119.98 × 66.31
  4. Step 4: Simplify right side
    87.08x = 7,955.96
  5. Step 5: Solve for x
    x = 7,955.96/87.08
  6. Step 6: Final answer
    x = 91.37

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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.