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Finding the Fourth Proportional to 801.11, 1,199.83 and 720.92

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Solution

The fourth proportional to 801.11, 1,199.83 and 720.92 is: 1,079.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    801.11 : 1,199.83 = 720.92 : x
  2. Step 2: Convert to fraction form
    801.11/1,199.83 = 720.92/x
  3. Step 3: Cross multiply
    801.11x = 1,199.83 × 720.92
  4. Step 4: Simplify right side
    801.11x = 864,981.44
  5. Step 5: Solve for x
    x = 864,981.44/801.11
  6. Step 6: Final answer
    x = 1,079.73

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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.