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Finding the Fourth Proportional to 318.38, 439 and 207.70

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Solution

The fourth proportional to 318.38, 439 and 207.70 is: 286.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.38 : 439 = 207.70 : x
  2. Step 2: Convert to fraction form
    318.38/439 = 207.70/x
  3. Step 3: Cross multiply
    318.38x = 439 × 207.70
  4. Step 4: Simplify right side
    318.38x = 91,180.30
  5. Step 5: Solve for x
    x = 91,180.30/318.38
  6. Step 6: Final answer
    x = 286.39

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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.