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Finding the Fourth Proportional to 318.93, 439.86 and 274.74

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Solution

The fourth proportional to 318.93, 439.86 and 274.74 is: 378.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.93 : 439.86 = 274.74 : x
  2. Step 2: Convert to fraction form
    318.93/439.86 = 274.74/x
  3. Step 3: Cross multiply
    318.93x = 439.86 × 274.74
  4. Step 4: Simplify right side
    318.93x = 120,846.52
  5. Step 5: Solve for x
    x = 120,846.52/318.93
  6. Step 6: Final answer
    x = 378.92

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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.