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Finding the Fourth Proportional to 99.26, 137.04 and 84.68

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Solution

The fourth proportional to 99.26, 137.04 and 84.68 is: 116.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.26 : 137.04 = 84.68 : x
  2. Step 2: Convert to fraction form
    99.26/137.04 = 84.68/x
  3. Step 3: Cross multiply
    99.26x = 137.04 × 84.68
  4. Step 4: Simplify right side
    99.26x = 11,604.55
  5. Step 5: Solve for x
    x = 11,604.55/99.26
  6. Step 6: Final answer
    x = 116.91

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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.