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Finding the Fourth Proportional to 166.92, 230.43 and 128.16

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Solution

The fourth proportional to 166.92, 230.43 and 128.16 is: 176.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    166.92 : 230.43 = 128.16 : x
  2. Step 2: Convert to fraction form
    166.92/230.43 = 128.16/x
  3. Step 3: Cross multiply
    166.92x = 230.43 × 128.16
  4. Step 4: Simplify right side
    166.92x = 29,531.91
  5. Step 5: Solve for x
    x = 29,531.91/166.92
  6. Step 6: Final answer
    x = 176.92

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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.