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Finding the Fourth Proportional to 39,884.60, 55,040.63 and 21,979.60

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Solution

The fourth proportional to 39,884.60, 55,040.63 and 21,979.60 is: 30,331.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,884.60 : 55,040.63 = 21,979.60 : x
  2. Step 2: Convert to fraction form
    39,884.60/55,040.63 = 21,979.60/x
  3. Step 3: Cross multiply
    39,884.60x = 55,040.63 × 21,979.60
  4. Step 4: Simplify right side
    39,884.60x = 1,209,770,783.65
  5. Step 5: Solve for x
    x = 1,209,770,783.65/39,884.60
  6. Step 6: Final answer
    x = 30,331.78

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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.