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Finding the Fourth Proportional to 119.16, 178.92 and 112.68

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Solution

The fourth proportional to 119.16, 178.92 and 112.68 is: 169.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.16 : 178.92 = 112.68 : x
  2. Step 2: Convert to fraction form
    119.16/178.92 = 112.68/x
  3. Step 3: Cross multiply
    119.16x = 178.92 × 112.68
  4. Step 4: Simplify right side
    119.16x = 20,160.71
  5. Step 5: Solve for x
    x = 20,160.71/119.16
  6. Step 6: Final answer
    x = 169.19

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.