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Finding the Fourth Proportional to 863.38, 1,287.07 and 850.06

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Solution

The fourth proportional to 863.38, 1,287.07 and 850.06 is: 1,267.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.38 : 1,287.07 = 850.06 : x
  2. Step 2: Convert to fraction form
    863.38/1,287.07 = 850.06/x
  3. Step 3: Cross multiply
    863.38x = 1,287.07 × 850.06
  4. Step 4: Simplify right side
    863.38x = 1,094,086.72
  5. Step 5: Solve for x
    x = 1,094,086.72/863.38
  6. Step 6: Final answer
    x = 1,267.21

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.