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Finding the Fourth Proportional to 395.87, 546.32 and 221.20

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Solution

The fourth proportional to 395.87, 546.32 and 221.20 is: 305.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.87 : 546.32 = 221.20 : x
  2. Step 2: Convert to fraction form
    395.87/546.32 = 221.20/x
  3. Step 3: Cross multiply
    395.87x = 546.32 × 221.20
  4. Step 4: Simplify right side
    395.87x = 120,845.17
  5. Step 5: Solve for x
    x = 120,845.17/395.87
  6. Step 6: Final answer
    x = 305.27

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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.