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Finding the Fourth Proportional to 318.54, 439.50 and 213.69

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Solution

The fourth proportional to 318.54, 439.50 and 213.69 is: 294.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.54 : 439.50 = 213.69 : x
  2. Step 2: Convert to fraction form
    318.54/439.50 = 213.69/x
  3. Step 3: Cross multiply
    318.54x = 439.50 × 213.69
  4. Step 4: Simplify right side
    318.54x = 93,916.76
  5. Step 5: Solve for x
    x = 93,916.76/318.54
  6. Step 6: Final answer
    x = 294.84

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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.