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Finding the Fourth Proportional to 189.63, 261.61 and 123.12

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Solution

The fourth proportional to 189.63, 261.61 and 123.12 is: 169.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.63 : 261.61 = 123.12 : x
  2. Step 2: Convert to fraction form
    189.63/261.61 = 123.12/x
  3. Step 3: Cross multiply
    189.63x = 261.61 × 123.12
  4. Step 4: Simplify right side
    189.63x = 32,209.12
  5. Step 5: Solve for x
    x = 32,209.12/189.63
  6. Step 6: Final answer
    x = 169.85

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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.