Home / 2,161.34-3,242.14-680.78

Finding the Fourth Proportional to 2,161.34, 3,242.14 and 680.78

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Solution

The fourth proportional to 2,161.34, 3,242.14 and 680.78 is: 1,021.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,161.34 : 3,242.14 = 680.78 : x
  2. Step 2: Convert to fraction form
    2,161.34/3,242.14 = 680.78/x
  3. Step 3: Cross multiply
    2,161.34x = 3,242.14 × 680.78
  4. Step 4: Simplify right side
    2,161.34x = 2,207,184.07
  5. Step 5: Solve for x
    x = 2,207,184.07/2,161.34
  6. Step 6: Final answer
    x = 1,021.21

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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.