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Finding the Fourth Proportional to 99.55, 137.23 and 66.75

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Solution

The fourth proportional to 99.55, 137.23 and 66.75 is: 92.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.55 : 137.23 = 66.75 : x
  2. Step 2: Convert to fraction form
    99.55/137.23 = 66.75/x
  3. Step 3: Cross multiply
    99.55x = 137.23 × 66.75
  4. Step 4: Simplify right side
    99.55x = 9,160.10
  5. Step 5: Solve for x
    x = 9,160.10/99.55
  6. Step 6: Final answer
    x = 92.02

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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.