Home / 3,929.48-5,422.70-2,161.20

Finding the Fourth Proportional to 3,929.48, 5,422.70 and 2,161.20

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Solution

The fourth proportional to 3,929.48, 5,422.70 and 2,161.20 is: 2,982.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,929.48 : 5,422.70 = 2,161.20 : x
  2. Step 2: Convert to fraction form
    3,929.48/5,422.70 = 2,161.20/x
  3. Step 3: Cross multiply
    3,929.48x = 5,422.70 × 2,161.20
  4. Step 4: Simplify right side
    3,929.48x = 11,719,501.32
  5. Step 5: Solve for x
    x = 11,719,501.32/3,929.48
  6. Step 6: Final answer
    x = 2,982.46

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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.