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Finding the Fourth Proportional to 863.28, 1,287.44 and 804.96

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Solution

The fourth proportional to 863.28, 1,287.44 and 804.96 is: 1,200.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.28 : 1,287.44 = 804.96 : x
  2. Step 2: Convert to fraction form
    863.28/1,287.44 = 804.96/x
  3. Step 3: Cross multiply
    863.28x = 1,287.44 × 804.96
  4. Step 4: Simplify right side
    863.28x = 1,036,337.70
  5. Step 5: Solve for x
    x = 1,036,337.70/863.28
  6. Step 6: Final answer
    x = 1,200.47

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1.5x scale

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.