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Finding the Fourth Proportional to 395.91, 546.35 and 221.25

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Solution

The fourth proportional to 395.91, 546.35 and 221.25 is: 305.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.91 : 546.35 = 221.25 : x
  2. Step 2: Convert to fraction form
    395.91/546.35 = 221.25/x
  3. Step 3: Cross multiply
    395.91x = 546.35 × 221.25
  4. Step 4: Simplify right side
    395.91x = 120,879.94
  5. Step 5: Solve for x
    x = 120,879.94/395.91
  6. Step 6: Final answer
    x = 305.32

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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.