Home / 2,161.90-2,983.35-1,217.71

Finding the Fourth Proportional to 2,161.90, 2,983.35 and 1,217.71

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Solution

The fourth proportional to 2,161.90, 2,983.35 and 1,217.71 is: 1,680.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,161.90 : 2,983.35 = 1,217.71 : x
  2. Step 2: Convert to fraction form
    2,161.90/2,983.35 = 1,217.71/x
  3. Step 3: Cross multiply
    2,161.90x = 2,983.35 × 1,217.71
  4. Step 4: Simplify right side
    2,161.90x = 3,632,855.13
  5. Step 5: Solve for x
    x = 3,632,855.13/2,161.90
  6. Step 6: Final answer
    x = 1,680.40

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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.