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Finding the Fourth Proportional to 189.64, 261.70 and 112

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Solution

The fourth proportional to 189.64, 261.70 and 112 is: 154.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.64 : 261.70 = 112 : x
  2. Step 2: Convert to fraction form
    189.64/261.70 = 112/x
  3. Step 3: Cross multiply
    189.64x = 261.70 × 112
  4. Step 4: Simplify right side
    189.64x = 29,310.40
  5. Step 5: Solve for x
    x = 29,310.40/189.64
  6. Step 6: Final answer
    x = 154.56

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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.