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Finding the Fourth Proportional to 124.80, 171.24 and 122.64

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Solution

The fourth proportional to 124.80, 171.24 and 122.64 is: 168.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.80 : 171.24 = 122.64 : x
  2. Step 2: Convert to fraction form
    124.80/171.24 = 122.64/x
  3. Step 3: Cross multiply
    124.80x = 171.24 × 122.64
  4. Step 4: Simplify right side
    124.80x = 21,000.87
  5. Step 5: Solve for x
    x = 21,000.87/124.80
  6. Step 6: Final answer
    x = 168.28

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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.