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Finding the Fourth Proportional to 113.85, 170.80 and 36.80

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Solution

The fourth proportional to 113.85, 170.80 and 36.80 is: 55.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.85 : 170.80 = 36.80 : x
  2. Step 2: Convert to fraction form
    113.85/170.80 = 36.80/x
  3. Step 3: Cross multiply
    113.85x = 170.80 × 36.80
  4. Step 4: Simplify right side
    113.85x = 6,285.44
  5. Step 5: Solve for x
    x = 6,285.44/113.85
  6. Step 6: Final answer
    x = 55.21

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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.