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Finding the Fourth Proportional to 189.44, 261.72 and 123.92

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Solution

The fourth proportional to 189.44, 261.72 and 123.92 is: 171.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.44 : 261.72 = 123.92 : x
  2. Step 2: Convert to fraction form
    189.44/261.72 = 123.92/x
  3. Step 3: Cross multiply
    189.44x = 261.72 × 123.92
  4. Step 4: Simplify right side
    189.44x = 32,432.34
  5. Step 5: Solve for x
    x = 32,432.34/189.44
  6. Step 6: Final answer
    x = 171.20

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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.