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Finding the Fourth Proportional to 116.75, 161.03 and 112.79

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Solution

The fourth proportional to 116.75, 161.03 and 112.79 is: 155.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    116.75 : 161.03 = 112.79 : x
  2. Step 2: Convert to fraction form
    116.75/161.03 = 112.79/x
  3. Step 3: Cross multiply
    116.75x = 161.03 × 112.79
  4. Step 4: Simplify right side
    116.75x = 18,162.05
  5. Step 5: Solve for x
    x = 18,162.05/116.75
  6. Step 6: Final answer
    x = 155.57

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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.