Home / 39,883.56-55,039.68-21,979.21

Finding the Fourth Proportional to 39,883.56, 55,039.68 and 21,979.21

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Solution

The fourth proportional to 39,883.56, 55,039.68 and 21,979.21 is: 30,331.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,883.56 : 55,039.68 = 21,979.21 : x
  2. Step 2: Convert to fraction form
    39,883.56/55,039.68 = 21,979.21/x
  3. Step 3: Cross multiply
    39,883.56x = 55,039.68 × 21,979.21
  4. Step 4: Simplify right side
    39,883.56x = 1,209,728,630.10
  5. Step 5: Solve for x
    x = 1,209,728,630.10/39,883.56
  6. Step 6: Final answer
    x = 30,331.51

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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.