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Finding the Fourth Proportional to 80.16, 119.66 and 68.62

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Solution

The fourth proportional to 80.16, 119.66 and 68.62 is: 102.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.16 : 119.66 = 68.62 : x
  2. Step 2: Convert to fraction form
    80.16/119.66 = 68.62/x
  3. Step 3: Cross multiply
    80.16x = 119.66 × 68.62
  4. Step 4: Simplify right side
    80.16x = 8,211.07
  5. Step 5: Solve for x
    x = 8,211.07/80.16
  6. Step 6: Final answer
    x = 102.43

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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.