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Finding the Fourth Proportional to 96.44, 144.02 and 86.72

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Solution

The fourth proportional to 96.44, 144.02 and 86.72 is: 129.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    96.44 : 144.02 = 86.72 : x
  2. Step 2: Convert to fraction form
    96.44/144.02 = 86.72/x
  3. Step 3: Cross multiply
    96.44x = 144.02 × 86.72
  4. Step 4: Simplify right side
    96.44x = 12,488.91
  5. Step 5: Solve for x
    x = 12,488.91/96.44
  6. Step 6: Final answer
    x = 129.51

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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.