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Finding the Fourth Proportional to 189.33, 261.12 and 122.86

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Solution

The fourth proportional to 189.33, 261.12 and 122.86 is: 169.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.33 : 261.12 = 122.86 : x
  2. Step 2: Convert to fraction form
    189.33/261.12 = 122.86/x
  3. Step 3: Cross multiply
    189.33x = 261.12 × 122.86
  4. Step 4: Simplify right side
    189.33x = 32,081.20
  5. Step 5: Solve for x
    x = 32,081.20/189.33
  6. Step 6: Final answer
    x = 169.45

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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.