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Finding the Fourth Proportional to 80.04, 119.49 and 78.69

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Solution

The fourth proportional to 80.04, 119.49 and 78.69 is: 117.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.04 : 119.49 = 78.69 : x
  2. Step 2: Convert to fraction form
    80.04/119.49 = 78.69/x
  3. Step 3: Cross multiply
    80.04x = 119.49 × 78.69
  4. Step 4: Simplify right side
    80.04x = 9,402.67
  5. Step 5: Solve for x
    x = 9,402.67/80.04
  6. Step 6: Final answer
    x = 117.47

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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.