Home / 39,896.80-55,057.76-21,991.44

Finding the Fourth Proportional to 39,896.80, 55,057.76 and 21,991.44

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Solution

The fourth proportional to 39,896.80, 55,057.76 and 21,991.44 is: 30,348.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,896.80 : 55,057.76 = 21,991.44 : x
  2. Step 2: Convert to fraction form
    39,896.80/55,057.76 = 21,991.44/x
  3. Step 3: Cross multiply
    39,896.80x = 55,057.76 × 21,991.44
  4. Step 4: Simplify right side
    39,896.80x = 1,210,799,425.57
  5. Step 5: Solve for x
    x = 1,210,799,425.57/39,896.80
  6. Step 6: Final answer
    x = 30,348.28

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1.5x scale

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.