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Finding the Fourth Proportional to 171.20, 236.20 and 113

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Solution

The fourth proportional to 171.20, 236.20 and 113 is: 155.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.20 : 236.20 = 113 : x
  2. Step 2: Convert to fraction form
    171.20/236.20 = 113/x
  3. Step 3: Cross multiply
    171.20x = 236.20 × 113
  4. Step 4: Simplify right side
    171.20x = 26,690.60
  5. Step 5: Solve for x
    x = 26,690.60/171.20
  6. Step 6: Final answer
    x = 155.90

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.