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Finding the Fourth Proportional to 394.80, 544.77 and 220.15

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Solution

The fourth proportional to 394.80, 544.77 and 220.15 is: 303.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.80 : 544.77 = 220.15 : x
  2. Step 2: Convert to fraction form
    394.80/544.77 = 220.15/x
  3. Step 3: Cross multiply
    394.80x = 544.77 × 220.15
  4. Step 4: Simplify right side
    394.80x = 119,931.12
  5. Step 5: Solve for x
    x = 119,931.12/394.80
  6. Step 6: Final answer
    x = 303.78

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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.