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Finding the Fourth Proportional to 166.60, 249.90 and 79.90

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Solution

The fourth proportional to 166.60, 249.90 and 79.90 is: 119.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    166.60 : 249.90 = 79.90 : x
  2. Step 2: Convert to fraction form
    166.60/249.90 = 79.90/x
  3. Step 3: Cross multiply
    166.60x = 249.90 × 79.90
  4. Step 4: Simplify right side
    166.60x = 19,967.01
  5. Step 5: Solve for x
    x = 19,967.01/166.60
  6. Step 6: Final answer
    x = 119.85

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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.