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Finding the Fourth Proportional to 189.13, 261.13 and 123.75

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Solution

The fourth proportional to 189.13, 261.13 and 123.75 is: 170.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.13 : 261.13 = 123.75 : x
  2. Step 2: Convert to fraction form
    189.13/261.13 = 123.75/x
  3. Step 3: Cross multiply
    189.13x = 261.13 × 123.75
  4. Step 4: Simplify right side
    189.13x = 32,313.53
  5. Step 5: Solve for x
    x = 32,313.53/189.13
  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.