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Finding the Fourth Proportional to 80.51, 120.96 and 75.65

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Solution

The fourth proportional to 80.51, 120.96 and 75.65 is: 113.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.51 : 120.96 = 75.65 : x
  2. Step 2: Convert to fraction form
    80.51/120.96 = 75.65/x
  3. Step 3: Cross multiply
    80.51x = 120.96 × 75.65
  4. Step 4: Simplify right side
    80.51x = 9,150.02
  5. Step 5: Solve for x
    x = 9,150.02/80.51
  6. Step 6: Final answer
    x = 113.66

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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.