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Finding the Fourth Proportional to 318.78, 439.92 and 277.47

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Solution

The fourth proportional to 318.78, 439.92 and 277.47 is: 382.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.78 : 439.92 = 277.47 : x
  2. Step 2: Convert to fraction form
    318.78/439.92 = 277.47/x
  3. Step 3: Cross multiply
    318.78x = 439.92 × 277.47
  4. Step 4: Simplify right side
    318.78x = 122,064.60
  5. Step 5: Solve for x
    x = 122,064.60/318.78
  6. Step 6: Final answer
    x = 382.91

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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.