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Finding the Fourth Proportional to 80.03, 119.91 and 78.05

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Solution

The fourth proportional to 80.03, 119.91 and 78.05 is: 116.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.03 : 119.91 = 78.05 : x
  2. Step 2: Convert to fraction form
    80.03/119.91 = 78.05/x
  3. Step 3: Cross multiply
    80.03x = 119.91 × 78.05
  4. Step 4: Simplify right side
    80.03x = 9,358.98
  5. Step 5: Solve for x
    x = 9,358.98/80.03
  6. Step 6: Final answer
    x = 116.94

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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.