Home / 2,161.20-2,982.48-1,217

Finding the Fourth Proportional to 2,161.20, 2,982.48 and 1,217

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Solution

The fourth proportional to 2,161.20, 2,982.48 and 1,217 is: 1,679.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,161.20 : 2,982.48 = 1,217 : x
  2. Step 2: Convert to fraction form
    2,161.20/2,982.48 = 1,217/x
  3. Step 3: Cross multiply
    2,161.20x = 2,982.48 × 1,217
  4. Step 4: Simplify right side
    2,161.20x = 3,629,678.16
  5. Step 5: Solve for x
    x = 3,629,678.16/2,161.20
  6. Step 6: Final answer
    x = 1,679.47

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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.