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Finding the Fourth Proportional to 318.76, 439.02 and 275.08

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Solution

The fourth proportional to 318.76, 439.02 and 275.08 is: 378.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.76 : 439.02 = 275.08 : x
  2. Step 2: Convert to fraction form
    318.76/439.02 = 275.08/x
  3. Step 3: Cross multiply
    318.76x = 439.02 × 275.08
  4. Step 4: Simplify right side
    318.76x = 120,765.62
  5. Step 5: Solve for x
    x = 120,765.62/318.76
  6. Step 6: Final answer
    x = 378.86

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.