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Finding the Fourth Proportional to 863.20, 1,285.84 and 788.32

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Solution

The fourth proportional to 863.20, 1,285.84 and 788.32 is: 1,174.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.20 : 1,285.84 = 788.32 : x
  2. Step 2: Convert to fraction form
    863.20/1,285.84 = 788.32/x
  3. Step 3: Cross multiply
    863.20x = 1,285.84 × 788.32
  4. Step 4: Simplify right side
    863.20x = 1,013,653.39
  5. Step 5: Solve for x
    x = 1,013,653.39/863.20
  6. Step 6: Final answer
    x = 1,174.30

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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.