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Finding the Fourth Proportional to 395.92, 546.36 and 221.30

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Solution

The fourth proportional to 395.92, 546.36 and 221.30 is: 305.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.92 : 546.36 = 221.30 : x
  2. Step 2: Convert to fraction form
    395.92/546.36 = 221.30/x
  3. Step 3: Cross multiply
    395.92x = 546.36 × 221.30
  4. Step 4: Simplify right side
    395.92x = 120,909.20
  5. Step 5: Solve for x
    x = 120,909.20/395.92
  6. Step 6: Final answer
    x = 305.39

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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.