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Finding the Fourth Proportional to 395.85, 546.26 and 218.81

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Solution

The fourth proportional to 395.85, 546.26 and 218.81 is: 301.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.85 : 546.26 = 218.81 : x
  2. Step 2: Convert to fraction form
    395.85/546.26 = 218.81/x
  3. Step 3: Cross multiply
    395.85x = 546.26 × 218.81
  4. Step 4: Simplify right side
    395.85x = 119,526.49
  5. Step 5: Solve for x
    x = 119,526.49/395.85
  6. Step 6: Final answer
    x = 301.95

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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.