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Finding the Fourth Proportional to 96.63, 144.18 and 86.89

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Solution

The fourth proportional to 96.63, 144.18 and 86.89 is: 129.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    96.63 : 144.18 = 86.89 : x
  2. Step 2: Convert to fraction form
    96.63/144.18 = 86.89/x
  3. Step 3: Cross multiply
    96.63x = 144.18 × 86.89
  4. Step 4: Simplify right side
    96.63x = 12,527.80
  5. Step 5: Solve for x
    x = 12,527.80/96.63
  6. Step 6: Final answer
    x = 129.65

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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.