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Finding the Fourth Proportional to 104.80, 157.32 and 80.56

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Solution

The fourth proportional to 104.80, 157.32 and 80.56 is: 120.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.80 : 157.32 = 80.56 : x
  2. Step 2: Convert to fraction form
    104.80/157.32 = 80.56/x
  3. Step 3: Cross multiply
    104.80x = 157.32 × 80.56
  4. Step 4: Simplify right side
    104.80x = 12,673.70
  5. Step 5: Solve for x
    x = 12,673.70/104.80
  6. Step 6: Final answer
    x = 120.93

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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.