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Finding the Fourth Proportional to 113.56, 170.19 and 91.94

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Solution

The fourth proportional to 113.56, 170.19 and 91.94 is: 137.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.56 : 170.19 = 91.94 : x
  2. Step 2: Convert to fraction form
    113.56/170.19 = 91.94/x
  3. Step 3: Cross multiply
    113.56x = 170.19 × 91.94
  4. Step 4: Simplify right side
    113.56x = 15,647.27
  5. Step 5: Solve for x
    x = 15,647.27/113.56
  6. Step 6: Final answer
    x = 137.79

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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.