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Finding the Fourth Proportional to 189.81, 261.89 and 116.12

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Solution

The fourth proportional to 189.81, 261.89 and 116.12 is: 160.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.81 : 261.89 = 116.12 : x
  2. Step 2: Convert to fraction form
    189.81/261.89 = 116.12/x
  3. Step 3: Cross multiply
    189.81x = 261.89 × 116.12
  4. Step 4: Simplify right side
    189.81x = 30,410.67
  5. Step 5: Solve for x
    x = 30,410.67/189.81
  6. Step 6: Final answer
    x = 160.22

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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.