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Finding the Fourth Proportional to 113.96, 170.90 and 40.82

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Solution

The fourth proportional to 113.96, 170.90 and 40.82 is: 61.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.96 : 170.90 = 40.82 : x
  2. Step 2: Convert to fraction form
    113.96/170.90 = 40.82/x
  3. Step 3: Cross multiply
    113.96x = 170.90 × 40.82
  4. Step 4: Simplify right side
    113.96x = 6,975.23
  5. Step 5: Solve for x
    x = 6,975.23/113.96
  6. Step 6: Final answer
    x = 61.21

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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.