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Finding the Fourth Proportional to 98.68, 136.17 and 65.88

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Solution

The fourth proportional to 98.68, 136.17 and 65.88 is: 90.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.68 : 136.17 = 65.88 : x
  2. Step 2: Convert to fraction form
    98.68/136.17 = 65.88/x
  3. Step 3: Cross multiply
    98.68x = 136.17 × 65.88
  4. Step 4: Simplify right side
    98.68x = 8,970.55
  5. Step 5: Solve for x
    x = 8,970.55/98.68
  6. Step 6: Final answer
    x = 90.91

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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.