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Finding the Fourth Proportional to 109,871.20, 164,806.80 and 74,879.20

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Solution

The fourth proportional to 109,871.20, 164,806.80 and 74,879.20 is: 112,318.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,871.20 : 164,806.80 = 74,879.20 : x
  2. Step 2: Convert to fraction form
    109,871.20/164,806.80 = 74,879.20/x
  3. Step 3: Cross multiply
    109,871.20x = 164,806.80 × 74,879.20
  4. Step 4: Simplify right side
    109,871.20x = 12,340,601,338.56
  5. Step 5: Solve for x
    x = 12,340,601,338.56/109,871.20
  6. Step 6: Final answer
    x = 112,318.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.