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Finding the Fourth Proportional to 128, 175.56 and 124.60

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Solution

The fourth proportional to 128, 175.56 and 124.60 is: 170.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    128 : 175.56 = 124.60 : x
  2. Step 2: Convert to fraction form
    128/175.56 = 124.60/x
  3. Step 3: Cross multiply
    128x = 175.56 × 124.60
  4. Step 4: Simplify right side
    128x = 21,874.78
  5. Step 5: Solve for x
    x = 21,874.78/128
  6. Step 6: Final answer
    x = 170.90

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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.