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Finding the Fourth Proportional to 73,081.80, 109,623.06 and 20,491.20

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Solution

The fourth proportional to 73,081.80, 109,623.06 and 20,491.20 is: 30,736.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    73,081.80 : 109,623.06 = 20,491.20 : x
  2. Step 2: Convert to fraction form
    73,081.80/109,623.06 = 20,491.20/x
  3. Step 3: Cross multiply
    73,081.80x = 109,623.06 × 20,491.20
  4. Step 4: Simplify right side
    73,081.80x = 2,246,308,047.07
  5. Step 5: Solve for x
    x = 2,246,308,047.07/73,081.80
  6. Step 6: Final answer
    x = 30,736.90

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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.