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Finding the Fourth Proportional to 395.63, 545.91 and 220.96

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Solution

The fourth proportional to 395.63, 545.91 and 220.96 is: 304.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.63 : 545.91 = 220.96 : x
  2. Step 2: Convert to fraction form
    395.63/545.91 = 220.96/x
  3. Step 3: Cross multiply
    395.63x = 545.91 × 220.96
  4. Step 4: Simplify right side
    395.63x = 120,621.54
  5. Step 5: Solve for x
    x = 120,621.54/395.63
  6. Step 6: Final answer
    x = 304.89

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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.