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Finding the Fourth Proportional to 171.79, 237.14 and 128.19

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Solution

The fourth proportional to 171.79, 237.14 and 128.19 is: 176.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.79 : 237.14 = 128.19 : x
  2. Step 2: Convert to fraction form
    171.79/237.14 = 128.19/x
  3. Step 3: Cross multiply
    171.79x = 237.14 × 128.19
  4. Step 4: Simplify right side
    171.79x = 30,398.98
  5. Step 5: Solve for x
    x = 30,398.98/171.79
  6. Step 6: Final answer
    x = 176.95

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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.