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Finding the Fourth Proportional to 87.68, 130.90 and 72.44

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Solution

The fourth proportional to 87.68, 130.90 and 72.44 is: 108.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.68 : 130.90 = 72.44 : x
  2. Step 2: Convert to fraction form
    87.68/130.90 = 72.44/x
  3. Step 3: Cross multiply
    87.68x = 130.90 × 72.44
  4. Step 4: Simplify right side
    87.68x = 9,482.40
  5. Step 5: Solve for x
    x = 9,482.40/87.68
  6. Step 6: Final answer
    x = 108.15

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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.