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Finding the Fourth Proportional to 318.36, 439.20 and 213.34

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Solution

The fourth proportional to 318.36, 439.20 and 213.34 is: 294.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.36 : 439.20 = 213.34 : x
  2. Step 2: Convert to fraction form
    318.36/439.20 = 213.34/x
  3. Step 3: Cross multiply
    318.36x = 439.20 × 213.34
  4. Step 4: Simplify right side
    318.36x = 93,698.93
  5. Step 5: Solve for x
    x = 93,698.93/318.36
  6. Step 6: Final answer
    x = 294.32

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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.