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Finding the Fourth Proportional to 87.99, 131.86 and 66.23

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Solution

The fourth proportional to 87.99, 131.86 and 66.23 is: 99.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.99 : 131.86 = 66.23 : x
  2. Step 2: Convert to fraction form
    87.99/131.86 = 66.23/x
  3. Step 3: Cross multiply
    87.99x = 131.86 × 66.23
  4. Step 4: Simplify right side
    87.99x = 8,733.09
  5. Step 5: Solve for x
    x = 8,733.09/87.99
  6. Step 6: Final answer
    x = 99.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.