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Finding the Fourth Proportional to 318.03, 439.28 and 286.93

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Solution

The fourth proportional to 318.03, 439.28 and 286.93 is: 396.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.03 : 439.28 = 286.93 : x
  2. Step 2: Convert to fraction form
    318.03/439.28 = 286.93/x
  3. Step 3: Cross multiply
    318.03x = 439.28 × 286.93
  4. Step 4: Simplify right side
    318.03x = 126,042.38
  5. Step 5: Solve for x
    x = 126,042.38/318.03
  6. Step 6: Final answer
    x = 396.33

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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.