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Finding the Fourth Proportional to 113.39, 170.09 and 90.85

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Solution

The fourth proportional to 113.39, 170.09 and 90.85 is: 136.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.39 : 170.09 = 90.85 : x
  2. Step 2: Convert to fraction form
    113.39/170.09 = 90.85/x
  3. Step 3: Cross multiply
    113.39x = 170.09 × 90.85
  4. Step 4: Simplify right side
    113.39x = 15,451.37
  5. Step 5: Solve for x
    x = 15,451.37/113.39
  6. Step 6: Final answer
    x = 136.27

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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.