Home / 3,929.12-5,422.02-2,160.62

Finding the Fourth Proportional to 3,929.12, 5,422.02 and 2,160.62

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Solution

The fourth proportional to 3,929.12, 5,422.02 and 2,160.62 is: 2,981.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,929.12 : 5,422.02 = 2,160.62 : x
  2. Step 2: Convert to fraction form
    3,929.12/5,422.02 = 2,160.62/x
  3. Step 3: Cross multiply
    3,929.12x = 5,422.02 × 2,160.62
  4. Step 4: Simplify right side
    3,929.12x = 11,714,903.14
  5. Step 5: Solve for x
    x = 11,714,903.14/3,929.12
  6. Step 6: Final answer
    x = 2,981.56

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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.