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Finding the Fourth Proportional to 395.87, 546.23 and 221.18

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Solution

The fourth proportional to 395.87, 546.23 and 221.18 is: 305.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.87 : 546.23 = 221.18 : x
  2. Step 2: Convert to fraction form
    395.87/546.23 = 221.18/x
  3. Step 3: Cross multiply
    395.87x = 546.23 × 221.18
  4. Step 4: Simplify right side
    395.87x = 120,812.97
  5. Step 5: Solve for x
    x = 120,812.97/395.87
  6. Step 6: Final answer
    x = 305.19

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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.