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Finding the Fourth Proportional to 87.21, 130.01 and 80.73

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Solution

The fourth proportional to 87.21, 130.01 and 80.73 is: 120.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.21 : 130.01 = 80.73 : x
  2. Step 2: Convert to fraction form
    87.21/130.01 = 80.73/x
  3. Step 3: Cross multiply
    87.21x = 130.01 × 80.73
  4. Step 4: Simplify right side
    87.21x = 10,495.30
  5. Step 5: Solve for x
    x = 10,495.30/87.21
  6. Step 6: Final answer
    x = 120.35

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.