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Finding the Fourth Proportional to 171.96, 237.38 and 128.22

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Solution

The fourth proportional to 171.96, 237.38 and 128.22 is: 177.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.96 : 237.38 = 128.22 : x
  2. Step 2: Convert to fraction form
    171.96/237.38 = 128.22/x
  3. Step 3: Cross multiply
    171.96x = 237.38 × 128.22
  4. Step 4: Simplify right side
    171.96x = 30,436.86
  5. Step 5: Solve for x
    x = 30,436.86/171.96
  6. Step 6: Final answer
    x = 177.00

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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.