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Finding the Fourth Proportional to 87.26, 130.94 and 80.30

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Solution

The fourth proportional to 87.26, 130.94 and 80.30 is: 120.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.26 : 130.94 = 80.30 : x
  2. Step 2: Convert to fraction form
    87.26/130.94 = 80.30/x
  3. Step 3: Cross multiply
    87.26x = 130.94 × 80.30
  4. Step 4: Simplify right side
    87.26x = 10,513.43
  5. Step 5: Solve for x
    x = 10,513.43/87.26
  6. Step 6: Final answer
    x = 120.49

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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.