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Finding the Fourth Proportional to 171.30, 236.16 and 138.48

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Solution

The fourth proportional to 171.30, 236.16 and 138.48 is: 190.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.30 : 236.16 = 138.48 : x
  2. Step 2: Convert to fraction form
    171.30/236.16 = 138.48/x
  3. Step 3: Cross multiply
    171.30x = 236.16 × 138.48
  4. Step 4: Simplify right side
    171.30x = 32,703.44
  5. Step 5: Solve for x
    x = 32,703.44/171.30
  6. Step 6: Final answer
    x = 190.91

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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.