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Finding the Fourth Proportional to 867.99, 1,198.38 and 774.57

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Solution

The fourth proportional to 867.99, 1,198.38 and 774.57 is: 1,069.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    867.99 : 1,198.38 = 774.57 : x
  2. Step 2: Convert to fraction form
    867.99/1,198.38 = 774.57/x
  3. Step 3: Cross multiply
    867.99x = 1,198.38 × 774.57
  4. Step 4: Simplify right side
    867.99x = 928,232.90
  5. Step 5: Solve for x
    x = 928,232.90/867.99
  6. Step 6: Final answer
    x = 1,069.41

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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.