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Finding the Fourth Proportional to 863.24, 1,188.35 and 780.09

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Solution

The fourth proportional to 863.24, 1,188.35 and 780.09 is: 1,073.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.24 : 1,188.35 = 780.09 : x
  2. Step 2: Convert to fraction form
    863.24/1,188.35 = 780.09/x
  3. Step 3: Cross multiply
    863.24x = 1,188.35 × 780.09
  4. Step 4: Simplify right side
    863.24x = 927,010.11
  5. Step 5: Solve for x
    x = 927,010.11/863.24
  6. Step 6: Final answer
    x = 1,073.88

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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.