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Finding the Fourth Proportional to 394.85, 544.90 and 220.21

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Solution

The fourth proportional to 394.85, 544.90 and 220.21 is: 303.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.85 : 544.90 = 220.21 : x
  2. Step 2: Convert to fraction form
    394.85/544.90 = 220.21/x
  3. Step 3: Cross multiply
    394.85x = 544.90 × 220.21
  4. Step 4: Simplify right side
    394.85x = 119,989.42
  5. Step 5: Solve for x
    x = 119,989.42/394.85
  6. Step 6: Final answer
    x = 303.89

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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.