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Finding the Fourth Proportional to 128.22, 175.52 and 124.08

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Solution

The fourth proportional to 128.22, 175.52 and 124.08 is: 169.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.22 : 175.52 = 124.08 : x
  2. Step 2: Convert to fraction form
    128.22/175.52 = 124.08/x
  3. Step 3: Cross multiply
    128.22x = 175.52 × 124.08
  4. Step 4: Simplify right side
    128.22x = 21,778.52
  5. Step 5: Solve for x
    x = 21,778.52/128.22
  6. Step 6: Final answer
    x = 169.85

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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.