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Finding the Fourth Proportional to 96.80, 144.43 and 87.68

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Solution

The fourth proportional to 96.80, 144.43 and 87.68 is: 130.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    96.80 : 144.43 = 87.68 : x
  2. Step 2: Convert to fraction form
    96.80/144.43 = 87.68/x
  3. Step 3: Cross multiply
    96.80x = 144.43 × 87.68
  4. Step 4: Simplify right side
    96.80x = 12,663.76
  5. Step 5: Solve for x
    x = 12,663.76/96.80
  6. Step 6: Final answer
    x = 130.83

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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.