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Finding the Fourth Proportional to 166.80, 249.90 and 128.34

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Solution

The fourth proportional to 166.80, 249.90 and 128.34 is: 192.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    166.80 : 249.90 = 128.34 : x
  2. Step 2: Convert to fraction form
    166.80/249.90 = 128.34/x
  3. Step 3: Cross multiply
    166.80x = 249.90 × 128.34
  4. Step 4: Simplify right side
    166.80x = 32,072.17
  5. Step 5: Solve for x
    x = 32,072.17/166.80
  6. Step 6: Final answer
    x = 192.28

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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.