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Finding the Fourth Proportional to 80.12, 119.91 and 78.32

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Solution

The fourth proportional to 80.12, 119.91 and 78.32 is: 117.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.12 : 119.91 = 78.32 : x
  2. Step 2: Convert to fraction form
    80.12/119.91 = 78.32/x
  3. Step 3: Cross multiply
    80.12x = 119.91 × 78.32
  4. Step 4: Simplify right side
    80.12x = 9,391.35
  5. Step 5: Solve for x
    x = 9,391.35/80.12
  6. Step 6: Final answer
    x = 117.22

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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.