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Finding the Fourth Proportional to 113.42, 170.25 and 90.86

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Solution

The fourth proportional to 113.42, 170.25 and 90.86 is: 136.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.42 : 170.25 = 90.86 : x
  2. Step 2: Convert to fraction form
    113.42/170.25 = 90.86/x
  3. Step 3: Cross multiply
    113.42x = 170.25 × 90.86
  4. Step 4: Simplify right side
    113.42x = 15,468.92
  5. Step 5: Solve for x
    x = 15,468.92/113.42
  6. Step 6: Final answer
    x = 136.39

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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.