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Finding the Fourth Proportional to 99.68, 137.50 and 66.88

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Solution

The fourth proportional to 99.68, 137.50 and 66.88 is: 92.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.68 : 137.50 = 66.88 : x
  2. Step 2: Convert to fraction form
    99.68/137.50 = 66.88/x
  3. Step 3: Cross multiply
    99.68x = 137.50 × 66.88
  4. Step 4: Simplify right side
    99.68x = 9,196
  5. Step 5: Solve for x
    x = 9,196/99.68
  6. Step 6: Final answer
    x = 92.26

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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.