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Finding the Fourth Proportional to 119.13, 178.41 and 84.74

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Solution

The fourth proportional to 119.13, 178.41 and 84.74 is: 126.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.13 : 178.41 = 84.74 : x
  2. Step 2: Convert to fraction form
    119.13/178.41 = 84.74/x
  3. Step 3: Cross multiply
    119.13x = 178.41 × 84.74
  4. Step 4: Simplify right side
    119.13x = 15,117.57
  5. Step 5: Solve for x
    x = 15,117.57/119.13
  6. Step 6: Final answer
    x = 126.90

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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.