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Finding the Fourth Proportional to 171.57, 236.57 and 138.72

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Solution

The fourth proportional to 171.57, 236.57 and 138.72 is: 191.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.57 : 236.57 = 138.72 : x
  2. Step 2: Convert to fraction form
    171.57/236.57 = 138.72/x
  3. Step 3: Cross multiply
    171.57x = 236.57 × 138.72
  4. Step 4: Simplify right side
    171.57x = 32,816.30
  5. Step 5: Solve for x
    x = 32,816.30/171.57
  6. Step 6: Final answer
    x = 191.27

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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.