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Finding the Fourth Proportional to 252.79, 379.19 and 79.47

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Solution

The fourth proportional to 252.79, 379.19 and 79.47 is: 119.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    252.79 : 379.19 = 79.47 : x
  2. Step 2: Convert to fraction form
    252.79/379.19 = 79.47/x
  3. Step 3: Cross multiply
    252.79x = 379.19 × 79.47
  4. Step 4: Simplify right side
    252.79x = 30,134.43
  5. Step 5: Solve for x
    x = 30,134.43/252.79
  6. Step 6: Final answer
    x = 119.21

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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.