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Finding the Fourth Proportional to 318.39, 439.46 and 207.68

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Solution

The fourth proportional to 318.39, 439.46 and 207.68 is: 286.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.39 : 439.46 = 207.68 : x
  2. Step 2: Convert to fraction form
    318.39/439.46 = 207.68/x
  3. Step 3: Cross multiply
    318.39x = 439.46 × 207.68
  4. Step 4: Simplify right side
    318.39x = 91,263.82
  5. Step 5: Solve for x
    x = 91,263.82/318.39
  6. Step 6: Final answer
    x = 286.64

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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.