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Finding the Fourth Proportional to 189.13, 261.05 and 111.55

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Solution

The fourth proportional to 189.13, 261.05 and 111.55 is: 153.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.13 : 261.05 = 111.55 : x
  2. Step 2: Convert to fraction form
    189.13/261.05 = 111.55/x
  3. Step 3: Cross multiply
    189.13x = 261.05 × 111.55
  4. Step 4: Simplify right side
    189.13x = 29,120.13
  5. Step 5: Solve for x
    x = 29,120.13/189.13
  6. Step 6: Final answer
    x = 153.97

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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.