Home / 81,912.96-112,981.91-79,169.49

Finding the Fourth Proportional to 81,912.96, 112,981.91 and 79,169.49

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Solution

The fourth proportional to 81,912.96, 112,981.91 and 79,169.49 is: 109,197.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,912.96 : 112,981.91 = 79,169.49 : x
  2. Step 2: Convert to fraction form
    81,912.96/112,981.91 = 79,169.49/x
  3. Step 3: Cross multiply
    81,912.96x = 112,981.91 × 79,169.49
  4. Step 4: Simplify right side
    81,912.96x = 8,944,719,798.08
  5. Step 5: Solve for x
    x = 8,944,719,798.08/81,912.96
  6. Step 6: Final answer
    x = 109,197.86

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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.