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Finding the Fourth Proportional to 723.28, 1,086.92 and 381.52

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Solution

The fourth proportional to 723.28, 1,086.92 and 381.52 is: 573.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    723.28 : 1,086.92 = 381.52 : x
  2. Step 2: Convert to fraction form
    723.28/1,086.92 = 381.52/x
  3. Step 3: Cross multiply
    723.28x = 1,086.92 × 381.52
  4. Step 4: Simplify right side
    723.28x = 414,681.72
  5. Step 5: Solve for x
    x = 414,681.72/723.28
  6. Step 6: Final answer
    x = 573.33

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.