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Finding the Fourth Proportional to 867.65, 1,198.19 and 742.56

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Solution

The fourth proportional to 867.65, 1,198.19 and 742.56 is: 1,025.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    867.65 : 1,198.19 = 742.56 : x
  2. Step 2: Convert to fraction form
    867.65/1,198.19 = 742.56/x
  3. Step 3: Cross multiply
    867.65x = 1,198.19 × 742.56
  4. Step 4: Simplify right side
    867.65x = 889,724.25
  5. Step 5: Solve for x
    x = 889,724.25/867.65
  6. Step 6: Final answer
    x = 1,025.45

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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.