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Finding the Fourth Proportional to 800.91, 1,105.95 and 774.79

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Solution

The fourth proportional to 800.91, 1,105.95 and 774.79 is: 1,069.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    800.91 : 1,105.95 = 774.79 : x
  2. Step 2: Convert to fraction form
    800.91/1,105.95 = 774.79/x
  3. Step 3: Cross multiply
    800.91x = 1,105.95 × 774.79
  4. Step 4: Simplify right side
    800.91x = 856,882.25
  5. Step 5: Solve for x
    x = 856,882.25/800.91
  6. Step 6: Final answer
    x = 1,069.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.