Home / 21,679.28-29,919.48-13,180.76

Finding the Fourth Proportional to 21,679.28, 29,919.48 and 13,180.76

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Solution

The fourth proportional to 21,679.28, 29,919.48 and 13,180.76 is: 18,190.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,679.28 : 29,919.48 = 13,180.76 : x
  2. Step 2: Convert to fraction form
    21,679.28/29,919.48 = 13,180.76/x
  3. Step 3: Cross multiply
    21,679.28x = 29,919.48 × 13,180.76
  4. Step 4: Simplify right side
    21,679.28x = 394,361,485.20
  5. Step 5: Solve for x
    x = 394,361,485.20/21,679.28
  6. Step 6: Final answer
    x = 18,190.71

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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.