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Finding the Fourth Proportional to 170.70, 255.90 and 98.61

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Solution

The fourth proportional to 170.70, 255.90 and 98.61 is: 147.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.70 : 255.90 = 98.61 : x
  2. Step 2: Convert to fraction form
    170.70/255.90 = 98.61/x
  3. Step 3: Cross multiply
    170.70x = 255.90 × 98.61
  4. Step 4: Simplify right side
    170.70x = 25,234.30
  5. Step 5: Solve for x
    x = 25,234.30/170.70
  6. Step 6: Final answer
    x = 147.83

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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.