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Finding the Fourth Proportional to 80.19, 120.73 and 66.60

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Solution

The fourth proportional to 80.19, 120.73 and 66.60 is: 100.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.19 : 120.73 = 66.60 : x
  2. Step 2: Convert to fraction form
    80.19/120.73 = 66.60/x
  3. Step 3: Cross multiply
    80.19x = 120.73 × 66.60
  4. Step 4: Simplify right side
    80.19x = 8,040.45
  5. Step 5: Solve for x
    x = 8,040.45/80.19
  6. Step 6: Final answer
    x = 100.27

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.