Home / 20,820.12-28,728.36-11,867.78

Finding the Fourth Proportional to 20,820.12, 28,728.36 and 11,867.78

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Solution

The fourth proportional to 20,820.12, 28,728.36 and 11,867.78 is: 16,375.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,820.12 : 28,728.36 = 11,867.78 : x
  2. Step 2: Convert to fraction form
    20,820.12/28,728.36 = 11,867.78/x
  3. Step 3: Cross multiply
    20,820.12x = 28,728.36 × 11,867.78
  4. Step 4: Simplify right side
    20,820.12x = 340,941,712.60
  5. Step 5: Solve for x
    x = 340,941,712.60/20,820.12
  6. Step 6: Final answer
    x = 16,375.59

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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.