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Finding the Fourth Proportional to 394.49, 544.65 and 305.81

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Solution

The fourth proportional to 394.49, 544.65 and 305.81 is: 422.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.49 : 544.65 = 305.81 : x
  2. Step 2: Convert to fraction form
    394.49/544.65 = 305.81/x
  3. Step 3: Cross multiply
    394.49x = 544.65 × 305.81
  4. Step 4: Simplify right side
    394.49x = 166,559.42
  5. Step 5: Solve for x
    x = 166,559.42/394.49
  6. Step 6: Final answer
    x = 422.21

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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.