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Finding the Fourth Proportional to 98.68, 136.20 and 63.72

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Solution

The fourth proportional to 98.68, 136.20 and 63.72 is: 87.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.68 : 136.20 = 63.72 : x
  2. Step 2: Convert to fraction form
    98.68/136.20 = 63.72/x
  3. Step 3: Cross multiply
    98.68x = 136.20 × 63.72
  4. Step 4: Simplify right side
    98.68x = 8,678.66
  5. Step 5: Solve for x
    x = 8,678.66/98.68
  6. Step 6: Final answer
    x = 87.95

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.