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Finding the Fourth Proportional to 535.85, 738.81 and 388.43

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Solution

The fourth proportional to 535.85, 738.81 and 388.43 is: 535.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    535.85 : 738.81 = 388.43 : x
  2. Step 2: Convert to fraction form
    535.85/738.81 = 388.43/x
  3. Step 3: Cross multiply
    535.85x = 738.81 × 388.43
  4. Step 4: Simplify right side
    535.85x = 286,972.27
  5. Step 5: Solve for x
    x = 286,972.27/535.85
  6. Step 6: Final answer
    x = 535.55

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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.