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Finding the Fourth Proportional to 122.48, 168.90 and 99.15

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Solution

The fourth proportional to 122.48, 168.90 and 99.15 is: 136.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.48 : 168.90 = 99.15 : x
  2. Step 2: Convert to fraction form
    122.48/168.90 = 99.15/x
  3. Step 3: Cross multiply
    122.48x = 168.90 × 99.15
  4. Step 4: Simplify right side
    122.48x = 16,745.09
  5. Step 5: Solve for x
    x = 16,745.09/122.48
  6. Step 6: Final answer
    x = 136.72

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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.