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Finding the Fourth Proportional to 122.60, 168.50 and 99.25

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Solution

The fourth proportional to 122.60, 168.50 and 99.25 is: 136.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.60 : 168.50 = 99.25 : x
  2. Step 2: Convert to fraction form
    122.60/168.50 = 99.25/x
  3. Step 3: Cross multiply
    122.60x = 168.50 × 99.25
  4. Step 4: Simplify right side
    122.60x = 16,723.45
  5. Step 5: Solve for x
    x = 16,723.45/122.60
  6. Step 6: Final answer
    x = 136.40

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.