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Finding the Fourth Proportional to 189.26, 261.05 and 111.63

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Solution

The fourth proportional to 189.26, 261.05 and 111.63 is: 153.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.26 : 261.05 = 111.63 : x
  2. Step 2: Convert to fraction form
    189.26/261.05 = 111.63/x
  3. Step 3: Cross multiply
    189.26x = 261.05 × 111.63
  4. Step 4: Simplify right side
    189.26x = 29,140.45
  5. Step 5: Solve for x
    x = 29,140.45/189.26
  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.