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Finding the Fourth Proportional to 318.59, 439.62 and 207.89

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Solution

The fourth proportional to 318.59, 439.62 and 207.89 is: 286.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.59 : 439.62 = 207.89 : x
  2. Step 2: Convert to fraction form
    318.59/439.62 = 207.89/x
  3. Step 3: Cross multiply
    318.59x = 439.62 × 207.89
  4. Step 4: Simplify right side
    318.59x = 91,392.60
  5. Step 5: Solve for x
    x = 91,392.60/318.59
  6. Step 6: Final answer
    x = 286.87

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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.