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Finding the Fourth Proportional to 189.70, 261.72 and 112.10

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Solution

The fourth proportional to 189.70, 261.72 and 112.10 is: 154.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.70 : 261.72 = 112.10 : x
  2. Step 2: Convert to fraction form
    189.70/261.72 = 112.10/x
  3. Step 3: Cross multiply
    189.70x = 261.72 × 112.10
  4. Step 4: Simplify right side
    189.70x = 29,338.81
  5. Step 5: Solve for x
    x = 29,338.81/189.70
  6. Step 6: Final answer
    x = 154.66

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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.