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Finding the Fourth Proportional to 842.86, 1,163.41 and 685.37

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Solution

The fourth proportional to 842.86, 1,163.41 and 685.37 is: 946.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.86 : 1,163.41 = 685.37 : x
  2. Step 2: Convert to fraction form
    842.86/1,163.41 = 685.37/x
  3. Step 3: Cross multiply
    842.86x = 1,163.41 × 685.37
  4. Step 4: Simplify right side
    842.86x = 797,360.49
  5. Step 5: Solve for x
    x = 797,360.49/842.86
  6. Step 6: Final answer
    x = 946.02

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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.