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Finding the Fourth Proportional to 189.34, 261.16 and 123.86

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Solution

The fourth proportional to 189.34, 261.16 and 123.86 is: 170.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.34 : 261.16 = 123.86 : x
  2. Step 2: Convert to fraction form
    189.34/261.16 = 123.86/x
  3. Step 3: Cross multiply
    189.34x = 261.16 × 123.86
  4. Step 4: Simplify right side
    189.34x = 32,347.62
  5. Step 5: Solve for x
    x = 32,347.62/189.34
  6. Step 6: Final answer
    x = 170.85

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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.