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Finding the Fourth Proportional to 166.70, 249.98 and 85.38

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Solution

The fourth proportional to 166.70, 249.98 and 85.38 is: 128.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    166.70 : 249.98 = 85.38 : x
  2. Step 2: Convert to fraction form
    166.70/249.98 = 85.38/x
  3. Step 3: Cross multiply
    166.70x = 249.98 × 85.38
  4. Step 4: Simplify right side
    166.70x = 21,342.87
  5. Step 5: Solve for x
    x = 21,342.87/166.70
  6. Step 6: Final answer
    x = 128.04

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.