Home / 3,929.66-5,423.06-2,161.40

Finding the Fourth Proportional to 3,929.66, 5,423.06 and 2,161.40

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Solution

The fourth proportional to 3,929.66, 5,423.06 and 2,161.40 is: 2,982.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,929.66 : 5,423.06 = 2,161.40 : x
  2. Step 2: Convert to fraction form
    3,929.66/5,423.06 = 2,161.40/x
  3. Step 3: Cross multiply
    3,929.66x = 5,423.06 × 2,161.40
  4. Step 4: Simplify right side
    3,929.66x = 11,721,401.88
  5. Step 5: Solve for x
    x = 11,721,401.88/3,929.66
  6. Step 6: Final answer
    x = 2,982.80

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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.