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Finding the Fourth Proportional to 171.72, 237.24 and 128.16

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Solution

The fourth proportional to 171.72, 237.24 and 128.16 is: 177.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.72 : 237.24 = 128.16 : x
  2. Step 2: Convert to fraction form
    171.72/237.24 = 128.16/x
  3. Step 3: Cross multiply
    171.72x = 237.24 × 128.16
  4. Step 4: Simplify right side
    171.72x = 30,404.68
  5. Step 5: Solve for x
    x = 30,404.68/171.72
  6. Step 6: Final answer
    x = 177.06

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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.