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Finding the Fourth Proportional to 863.87, 1,188.90 and 785.39

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Solution

The fourth proportional to 863.87, 1,188.90 and 785.39 is: 1,080.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.87 : 1,188.90 = 785.39 : x
  2. Step 2: Convert to fraction form
    863.87/1,188.90 = 785.39/x
  3. Step 3: Cross multiply
    863.87x = 1,188.90 × 785.39
  4. Step 4: Simplify right side
    863.87x = 933,744.23
  5. Step 5: Solve for x
    x = 933,744.23/863.87
  6. Step 6: Final answer
    x = 1,080.89

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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.