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Finding the Fourth Proportional to 113.65, 170.17 and 81.17

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Solution

The fourth proportional to 113.65, 170.17 and 81.17 is: 121.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.65 : 170.17 = 81.17 : x
  2. Step 2: Convert to fraction form
    113.65/170.17 = 81.17/x
  3. Step 3: Cross multiply
    113.65x = 170.17 × 81.17
  4. Step 4: Simplify right side
    113.65x = 13,812.70
  5. Step 5: Solve for x
    x = 13,812.70/113.65
  6. Step 6: Final answer
    x = 121.54

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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.