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Finding the Fourth Proportional to 259,720.80, 389,581.20 and 206,576.70

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Solution

The fourth proportional to 259,720.80, 389,581.20 and 206,576.70 is: 309,865.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,720.80 : 389,581.20 = 206,576.70 : x
  2. Step 2: Convert to fraction form
    259,720.80/389,581.20 = 206,576.70/x
  3. Step 3: Cross multiply
    259,720.80x = 389,581.20 × 206,576.70
  4. Step 4: Simplify right side
    259,720.80x = 80,478,398,678.04
  5. Step 5: Solve for x
    x = 80,478,398,678.04/259,720.80
  6. Step 6: Final answer
    x = 309,865.05

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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.