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Finding the Fourth Proportional to 80.36, 120.08 and 66.84

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Solution

The fourth proportional to 80.36, 120.08 and 66.84 is: 99.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.36 : 120.08 = 66.84 : x
  2. Step 2: Convert to fraction form
    80.36/120.08 = 66.84/x
  3. Step 3: Cross multiply
    80.36x = 120.08 × 66.84
  4. Step 4: Simplify right side
    80.36x = 8,026.15
  5. Step 5: Solve for x
    x = 8,026.15/80.36
  6. Step 6: Final answer
    x = 99.88

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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.