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Finding the Fourth Proportional to 79,969.80, 119,954.85 and 20,805.37

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Solution

The fourth proportional to 79,969.80, 119,954.85 and 20,805.37 is: 31,208.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,969.80 : 119,954.85 = 20,805.37 : x
  2. Step 2: Convert to fraction form
    79,969.80/119,954.85 = 20,805.37/x
  3. Step 3: Cross multiply
    79,969.80x = 119,954.85 × 20,805.37
  4. Step 4: Simplify right side
    79,969.80x = 2,495,705,037.54
  5. Step 5: Solve for x
    x = 2,495,705,037.54/79,969.80
  6. Step 6: Final answer
    x = 31,208.09

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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.