Home / 3,929.78-5,423.25-2,161.35

Finding the Fourth Proportional to 3,929.78, 5,423.25 and 2,161.35

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Solution

The fourth proportional to 3,929.78, 5,423.25 and 2,161.35 is: 2,982.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,929.78 : 5,423.25 = 2,161.35 : x
  2. Step 2: Convert to fraction form
    3,929.78/5,423.25 = 2,161.35/x
  3. Step 3: Cross multiply
    3,929.78x = 5,423.25 × 2,161.35
  4. Step 4: Simplify right side
    3,929.78x = 11,721,541.39
  5. Step 5: Solve for x
    x = 11,721,541.39/3,929.78
  6. Step 6: Final answer
    x = 2,982.75

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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.