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Finding the Fourth Proportional to 318.34, 439.36 and 207.91

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Solution

The fourth proportional to 318.34, 439.36 and 207.91 is: 286.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.34 : 439.36 = 207.91 : x
  2. Step 2: Convert to fraction form
    318.34/439.36 = 207.91/x
  3. Step 3: Cross multiply
    318.34x = 439.36 × 207.91
  4. Step 4: Simplify right side
    318.34x = 91,345.66
  5. Step 5: Solve for x
    x = 91,345.66/318.34
  6. Step 6: Final answer
    x = 286.95

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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.