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Finding the Fourth Proportional to 200,209.21, 300,104.60 and 66,979.87

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Solution

The fourth proportional to 200,209.21, 300,104.60 and 66,979.87 is: 100,399.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    200,209.21 : 300,104.60 = 66,979.87 : x
  2. Step 2: Convert to fraction form
    200,209.21/300,104.60 = 66,979.87/x
  3. Step 3: Cross multiply
    200,209.21x = 300,104.60 × 66,979.87
  4. Step 4: Simplify right side
    200,209.21x = 20,100,966,009.24
  5. Step 5: Solve for x
    x = 20,100,966,009.24/200,209.21
  6. Step 6: Final answer
    x = 100,399.81

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1.5x scale

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.