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Finding the Fourth Proportional to 179.90, 269.40 and 98.78

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Solution

The fourth proportional to 179.90, 269.40 and 98.78 is: 147.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    179.90 : 269.40 = 98.78 : x
  2. Step 2: Convert to fraction form
    179.90/269.40 = 98.78/x
  3. Step 3: Cross multiply
    179.90x = 269.40 × 98.78
  4. Step 4: Simplify right side
    179.90x = 26,611.33
  5. Step 5: Solve for x
    x = 26,611.33/179.90
  6. Step 6: Final answer
    x = 147.92

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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.