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Finding the Fourth Proportional to 78,803.92, 108,745.60 and 42,991.80

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Solution

The fourth proportional to 78,803.92, 108,745.60 and 42,991.80 is: 59,326.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,803.92 : 108,745.60 = 42,991.80 : x
  2. Step 2: Convert to fraction form
    78,803.92/108,745.60 = 42,991.80/x
  3. Step 3: Cross multiply
    78,803.92x = 108,745.60 × 42,991.80
  4. Step 4: Simplify right side
    78,803.92x = 4,675,169,086.08
  5. Step 5: Solve for x
    x = 4,675,169,086.08/78,803.92
  6. Step 6: Final answer
    x = 59,326.61

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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.