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Finding the Fourth Proportional to 166.68, 230.16 and 128.04

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Solution

The fourth proportional to 166.68, 230.16 and 128.04 is: 176.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    166.68 : 230.16 = 128.04 : x
  2. Step 2: Convert to fraction form
    166.68/230.16 = 128.04/x
  3. Step 3: Cross multiply
    166.68x = 230.16 × 128.04
  4. Step 4: Simplify right side
    166.68x = 29,469.69
  5. Step 5: Solve for x
    x = 29,469.69/166.68
  6. Step 6: Final answer
    x = 176.80

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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.