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Finding the Fourth Proportional to 800.38, 1,199.76 and 539.76

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Solution

The fourth proportional to 800.38, 1,199.76 and 539.76 is: 809.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    800.38 : 1,199.76 = 539.76 : x
  2. Step 2: Convert to fraction form
    800.38/1,199.76 = 539.76/x
  3. Step 3: Cross multiply
    800.38x = 1,199.76 × 539.76
  4. Step 4: Simplify right side
    800.38x = 647,584.93
  5. Step 5: Solve for x
    x = 647,584.93/800.38
  6. Step 6: Final answer
    x = 809.10

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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.