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Finding the Fourth Proportional to 171.39, 236.45 and 109.20

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Solution

The fourth proportional to 171.39, 236.45 and 109.20 is: 150.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.39 : 236.45 = 109.20 : x
  2. Step 2: Convert to fraction form
    171.39/236.45 = 109.20/x
  3. Step 3: Cross multiply
    171.39x = 236.45 × 109.20
  4. Step 4: Simplify right side
    171.39x = 25,819.79
  5. Step 5: Solve for x
    x = 25,819.79/171.39
  6. Step 6: Final answer
    x = 150.65

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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.