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Finding the Fourth Proportional to 394.35, 544.31 and 388.43

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Solution

The fourth proportional to 394.35, 544.31 and 388.43 is: 536.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.35 : 544.31 = 388.43 : x
  2. Step 2: Convert to fraction form
    394.35/544.31 = 388.43/x
  3. Step 3: Cross multiply
    394.35x = 544.31 × 388.43
  4. Step 4: Simplify right side
    394.35x = 211,426.33
  5. Step 5: Solve for x
    x = 211,426.33/394.35
  6. Step 6: Final answer
    x = 536.14

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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.