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Finding the Fourth Proportional to 119.91, 180 and 76.74

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Solution

The fourth proportional to 119.91, 180 and 76.74 is: 115.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.91 : 180 = 76.74 : x
  2. Step 2: Convert to fraction form
    119.91/180 = 76.74/x
  3. Step 3: Cross multiply
    119.91x = 180 × 76.74
  4. Step 4: Simplify right side
    119.91x = 13,813.20
  5. Step 5: Solve for x
    x = 13,813.20/119.91
  6. Step 6: Final answer
    x = 115.20

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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.