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Finding the Fourth Proportional to 79.05, 119.20 and 74.80

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Solution

The fourth proportional to 79.05, 119.20 and 74.80 is: 112.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.05 : 119.20 = 74.80 : x
  2. Step 2: Convert to fraction form
    79.05/119.20 = 74.80/x
  3. Step 3: Cross multiply
    79.05x = 119.20 × 74.80
  4. Step 4: Simplify right side
    79.05x = 8,916.16
  5. Step 5: Solve for x
    x = 8,916.16/79.05
  6. Step 6: Final answer
    x = 112.79

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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.