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Finding the Fourth Proportional to 189.42, 261.30 and 123

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Solution

The fourth proportional to 189.42, 261.30 and 123 is: 169.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.42 : 261.30 = 123 : x
  2. Step 2: Convert to fraction form
    189.42/261.30 = 123/x
  3. Step 3: Cross multiply
    189.42x = 261.30 × 123
  4. Step 4: Simplify right side
    189.42x = 32,139.90
  5. Step 5: Solve for x
    x = 32,139.90/189.42
  6. Step 6: Final answer
    x = 169.68

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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.