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Finding the Fourth Proportional to 189.16, 261.12 and 123.76

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Solution

The fourth proportional to 189.16, 261.12 and 123.76 is: 170.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.16 : 261.12 = 123.76 : x
  2. Step 2: Convert to fraction form
    189.16/261.12 = 123.76/x
  3. Step 3: Cross multiply
    189.16x = 261.12 × 123.76
  4. Step 4: Simplify right side
    189.16x = 32,316.21
  5. Step 5: Solve for x
    x = 32,316.21/189.16
  6. Step 6: Final answer
    x = 170.84

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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.