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Finding the Fourth Proportional to 393.75, 544.38 and 366.21

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Solution

The fourth proportional to 393.75, 544.38 and 366.21 is: 506.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.75 : 544.38 = 366.21 : x
  2. Step 2: Convert to fraction form
    393.75/544.38 = 366.21/x
  3. Step 3: Cross multiply
    393.75x = 544.38 × 366.21
  4. Step 4: Simplify right side
    393.75x = 199,357.40
  5. Step 5: Solve for x
    x = 199,357.40/393.75
  6. Step 6: Final answer
    x = 506.30

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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.