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Finding the Fourth Proportional to 318.31, 439.35 and 207.79

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Solution

The fourth proportional to 318.31, 439.35 and 207.79 is: 286.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.31 : 439.35 = 207.79 : x
  2. Step 2: Convert to fraction form
    318.31/439.35 = 207.79/x
  3. Step 3: Cross multiply
    318.31x = 439.35 × 207.79
  4. Step 4: Simplify right side
    318.31x = 91,292.54
  5. Step 5: Solve for x
    x = 91,292.54/318.31
  6. Step 6: Final answer
    x = 286.80

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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.