Home / 21,824.32-30,120-12,394.56

Finding the Fourth Proportional to 21,824.32, 30,120 and 12,394.56

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Solution

The fourth proportional to 21,824.32, 30,120 and 12,394.56 is: 17,105.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,824.32 : 30,120 = 12,394.56 : x
  2. Step 2: Convert to fraction form
    21,824.32/30,120 = 12,394.56/x
  3. Step 3: Cross multiply
    21,824.32x = 30,120 × 12,394.56
  4. Step 4: Simplify right side
    21,824.32x = 373,324,147.20
  5. Step 5: Solve for x
    x = 373,324,147.20/21,824.32
  6. Step 6: Final answer
    x = 17,105.88

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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.