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Finding the Fourth Proportional to 119.74, 178.54 and 113.86

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Solution

The fourth proportional to 119.74, 178.54 and 113.86 is: 169.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.74 : 178.54 = 113.86 : x
  2. Step 2: Convert to fraction form
    119.74/178.54 = 113.86/x
  3. Step 3: Cross multiply
    119.74x = 178.54 × 113.86
  4. Step 4: Simplify right side
    119.74x = 20,328.56
  5. Step 5: Solve for x
    x = 20,328.56/119.74
  6. Step 6: Final answer
    x = 169.77

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.