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Finding the Fourth Proportional to 801.11, 1,200.95 and 287.99

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Solution

The fourth proportional to 801.11, 1,200.95 and 287.99 is: 431.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    801.11 : 1,200.95 = 287.99 : x
  2. Step 2: Convert to fraction form
    801.11/1,200.95 = 287.99/x
  3. Step 3: Cross multiply
    801.11x = 1,200.95 × 287.99
  4. Step 4: Simplify right side
    801.11x = 345,860.15
  5. Step 5: Solve for x
    x = 345,860.15/801.11
  6. Step 6: Final answer
    x = 431.73

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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.