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Finding the Fourth Proportional to 318.95, 439.70 and 213.85

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Solution

The fourth proportional to 318.95, 439.70 and 213.85 is: 294.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.95 : 439.70 = 213.85 : x
  2. Step 2: Convert to fraction form
    318.95/439.70 = 213.85/x
  3. Step 3: Cross multiply
    318.95x = 439.70 × 213.85
  4. Step 4: Simplify right side
    318.95x = 94,029.28
  5. Step 5: Solve for x
    x = 94,029.28/318.95
  6. Step 6: Final answer
    x = 294.81

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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.