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Finding the Fourth Proportional to 189.26, 261.15 and 122.88

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Solution

The fourth proportional to 189.26, 261.15 and 122.88 is: 169.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.26 : 261.15 = 122.88 : x
  2. Step 2: Convert to fraction form
    189.26/261.15 = 122.88/x
  3. Step 3: Cross multiply
    189.26x = 261.15 × 122.88
  4. Step 4: Simplify right side
    189.26x = 32,090.11
  5. Step 5: Solve for x
    x = 32,090.11/189.26
  6. Step 6: Final answer
    x = 169.56

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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.