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Finding the Fourth Proportional to 394.55, 544.49 and 219.90

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Solution

The fourth proportional to 394.55, 544.49 and 219.90 is: 303.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.55 : 544.49 = 219.90 : x
  2. Step 2: Convert to fraction form
    394.55/544.49 = 219.90/x
  3. Step 3: Cross multiply
    394.55x = 544.49 × 219.90
  4. Step 4: Simplify right side
    394.55x = 119,733.35
  5. Step 5: Solve for x
    x = 119,733.35/394.55
  6. Step 6: Final answer
    x = 303.47

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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.