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Finding the Fourth Proportional to 189.30, 261.13 and 111.66

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Solution

The fourth proportional to 189.30, 261.13 and 111.66 is: 154.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.30 : 261.13 = 111.66 : x
  2. Step 2: Convert to fraction form
    189.30/261.13 = 111.66/x
  3. Step 3: Cross multiply
    189.30x = 261.13 × 111.66
  4. Step 4: Simplify right side
    189.30x = 29,157.78
  5. Step 5: Solve for x
    x = 29,157.78/189.30
  6. Step 6: Final answer
    x = 154.03

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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.