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Finding the Fourth Proportional to 79,972.99, 119,959.64 and 20,808.56

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Solution

The fourth proportional to 79,972.99, 119,959.64 and 20,808.56 is: 31,212.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,972.99 : 119,959.64 = 20,808.56 : x
  2. Step 2: Convert to fraction form
    79,972.99/119,959.64 = 20,808.56/x
  3. Step 3: Cross multiply
    79,972.99x = 119,959.64 × 20,808.56
  4. Step 4: Simplify right side
    79,972.99x = 2,496,187,366.52
  5. Step 5: Solve for x
    x = 2,496,187,366.52/79,972.99
  6. Step 6: Final answer
    x = 31,212.88

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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.