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Finding the Fourth Proportional to 318.63, 439.65 and 220.35

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Solution

The fourth proportional to 318.63, 439.65 and 220.35 is: 304.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.63 : 439.65 = 220.35 : x
  2. Step 2: Convert to fraction form
    318.63/439.65 = 220.35/x
  3. Step 3: Cross multiply
    318.63x = 439.65 × 220.35
  4. Step 4: Simplify right side
    318.63x = 96,876.88
  5. Step 5: Solve for x
    x = 96,876.88/318.63
  6. Step 6: Final answer
    x = 304.04

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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.