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Finding the Fourth Proportional to 79.60, 119.40 and 25.49

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Solution

The fourth proportional to 79.60, 119.40 and 25.49 is: 38.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.60 : 119.40 = 25.49 : x
  2. Step 2: Convert to fraction form
    79.60/119.40 = 25.49/x
  3. Step 3: Cross multiply
    79.60x = 119.40 × 25.49
  4. Step 4: Simplify right side
    79.60x = 3,042.78
  5. Step 5: Solve for x
    x = 3,042.78/79.60
  6. Step 6: Final answer
    x = 38.23

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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.