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Finding the Fourth Proportional to 87.16, 130.62 and 65.80

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Solution

The fourth proportional to 87.16, 130.62 and 65.80 is: 98.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.16 : 130.62 = 65.80 : x
  2. Step 2: Convert to fraction form
    87.16/130.62 = 65.80/x
  3. Step 3: Cross multiply
    87.16x = 130.62 × 65.80
  4. Step 4: Simplify right side
    87.16x = 8,594.80
  5. Step 5: Solve for x
    x = 8,594.80/87.16
  6. Step 6: Final answer
    x = 98.61

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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.