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Finding the Fourth Proportional to 87.03, 130.22 and 77.82

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Solution

The fourth proportional to 87.03, 130.22 and 77.82 is: 116.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.03 : 130.22 = 77.82 : x
  2. Step 2: Convert to fraction form
    87.03/130.22 = 77.82/x
  3. Step 3: Cross multiply
    87.03x = 130.22 × 77.82
  4. Step 4: Simplify right side
    87.03x = 10,133.72
  5. Step 5: Solve for x
    x = 10,133.72/87.03
  6. Step 6: Final answer
    x = 116.44

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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.