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Finding the Fourth Proportional to 189.31, 261.28 and 123.96

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Solution

The fourth proportional to 189.31, 261.28 and 123.96 is: 171.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.31 : 261.28 = 123.96 : x
  2. Step 2: Convert to fraction form
    189.31/261.28 = 123.96/x
  3. Step 3: Cross multiply
    189.31x = 261.28 × 123.96
  4. Step 4: Simplify right side
    189.31x = 32,388.27
  5. Step 5: Solve for x
    x = 32,388.27/189.31
  6. Step 6: Final answer
    x = 171.09

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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.