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Finding the Fourth Proportional to 318.72, 439.76 and 220.50

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Solution

The fourth proportional to 318.72, 439.76 and 220.50 is: 304.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.72 : 439.76 = 220.50 : x
  2. Step 2: Convert to fraction form
    318.72/439.76 = 220.50/x
  3. Step 3: Cross multiply
    318.72x = 439.76 × 220.50
  4. Step 4: Simplify right side
    318.72x = 96,967.08
  5. Step 5: Solve for x
    x = 96,967.08/318.72
  6. Step 6: Final answer
    x = 304.24

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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.