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Finding the Fourth Proportional to 318.59, 439.60 and 213.85

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Solution

The fourth proportional to 318.59, 439.60 and 213.85 is: 295.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.59 : 439.60 = 213.85 : x
  2. Step 2: Convert to fraction form
    318.59/439.60 = 213.85/x
  3. Step 3: Cross multiply
    318.59x = 439.60 × 213.85
  4. Step 4: Simplify right side
    318.59x = 94,008.88
  5. Step 5: Solve for x
    x = 94,008.88/318.59
  6. Step 6: Final answer
    x = 295.08

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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.