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Finding the Fourth Proportional to 80.28, 120.51 and 79.02

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Solution

The fourth proportional to 80.28, 120.51 and 79.02 is: 118.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.28 : 120.51 = 79.02 : x
  2. Step 2: Convert to fraction form
    80.28/120.51 = 79.02/x
  3. Step 3: Cross multiply
    80.28x = 120.51 × 79.02
  4. Step 4: Simplify right side
    80.28x = 9,522.70
  5. Step 5: Solve for x
    x = 9,522.70/80.28
  6. Step 6: Final answer
    x = 118.62

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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.