Home / 3,929.77-5,422.93-2,161.36

Finding the Fourth Proportional to 3,929.77, 5,422.93 and 2,161.36

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Solution

The fourth proportional to 3,929.77, 5,422.93 and 2,161.36 is: 2,982.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,929.77 : 5,422.93 = 2,161.36 : x
  2. Step 2: Convert to fraction form
    3,929.77/5,422.93 = 2,161.36/x
  3. Step 3: Cross multiply
    3,929.77x = 5,422.93 × 2,161.36
  4. Step 4: Simplify right side
    3,929.77x = 11,720,885.02
  5. Step 5: Solve for x
    x = 11,720,885.02/3,929.77
  6. Step 6: Final answer
    x = 2,982.59

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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.