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Finding the Fourth Proportional to 318.92, 439.60 and 220.64

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Solution

The fourth proportional to 318.92, 439.60 and 220.64 is: 304.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.92 : 439.60 = 220.64 : x
  2. Step 2: Convert to fraction form
    318.92/439.60 = 220.64/x
  3. Step 3: Cross multiply
    318.92x = 439.60 × 220.64
  4. Step 4: Simplify right side
    318.92x = 96,993.34
  5. Step 5: Solve for x
    x = 96,993.34/318.92
  6. Step 6: Final answer
    x = 304.13

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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.