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Finding the Fourth Proportional to 386.28, 535.44 and 372.84

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Solution

The fourth proportional to 386.28, 535.44 and 372.84 is: 516.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.28 : 535.44 = 372.84 : x
  2. Step 2: Convert to fraction form
    386.28/535.44 = 372.84/x
  3. Step 3: Cross multiply
    386.28x = 535.44 × 372.84
  4. Step 4: Simplify right side
    386.28x = 199,633.45
  5. Step 5: Solve for x
    x = 199,633.45/386.28
  6. Step 6: Final answer
    x = 516.81

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.