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Finding the Fourth Proportional to 79.42, 119.12 and 25.31

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Solution

The fourth proportional to 79.42, 119.12 and 25.31 is: 37.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.42 : 119.12 = 25.31 : x
  2. Step 2: Convert to fraction form
    79.42/119.12 = 25.31/x
  3. Step 3: Cross multiply
    79.42x = 119.12 × 25.31
  4. Step 4: Simplify right side
    79.42x = 3,014.33
  5. Step 5: Solve for x
    x = 3,014.33/79.42
  6. Step 6: Final answer
    x = 37.95

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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.