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Finding the Fourth Proportional to 863.86, 1,191.98 and 820.07

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Solution

The fourth proportional to 863.86, 1,191.98 and 820.07 is: 1,131.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.86 : 1,191.98 = 820.07 : x
  2. Step 2: Convert to fraction form
    863.86/1,191.98 = 820.07/x
  3. Step 3: Cross multiply
    863.86x = 1,191.98 × 820.07
  4. Step 4: Simplify right side
    863.86x = 977,505.92
  5. Step 5: Solve for x
    x = 977,505.92/863.86
  6. Step 6: Final answer
    x = 1,131.56

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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.