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Finding the Fourth Proportional to 318.44, 439.86 and 274.76

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Solution

The fourth proportional to 318.44, 439.86 and 274.76 is: 379.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.44 : 439.86 = 274.76 : x
  2. Step 2: Convert to fraction form
    318.44/439.86 = 274.76/x
  3. Step 3: Cross multiply
    318.44x = 439.86 × 274.76
  4. Step 4: Simplify right side
    318.44x = 120,855.93
  5. Step 5: Solve for x
    x = 120,855.93/318.44
  6. Step 6: Final answer
    x = 379.52

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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.