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Finding the Fourth Proportional to 79,973.80, 119,960.86 and 20,809.38

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Solution

The fourth proportional to 79,973.80, 119,960.86 and 20,809.38 is: 31,214.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,973.80 : 119,960.86 = 20,809.38 : x
  2. Step 2: Convert to fraction form
    79,973.80/119,960.86 = 20,809.38/x
  3. Step 3: Cross multiply
    79,973.80x = 119,960.86 × 20,809.38
  4. Step 4: Simplify right side
    79,973.80x = 2,496,311,120.87
  5. Step 5: Solve for x
    x = 2,496,311,120.87/79,973.80
  6. Step 6: Final answer
    x = 31,214.11

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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.