Home / 18,709.28-25,812.78-12,422.90

Finding the Fourth Proportional to 18,709.28, 25,812.78 and 12,422.90

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Solution

The fourth proportional to 18,709.28, 25,812.78 and 12,422.90 is: 17,139.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,709.28 : 25,812.78 = 12,422.90 : x
  2. Step 2: Convert to fraction form
    18,709.28/25,812.78 = 12,422.90/x
  3. Step 3: Cross multiply
    18,709.28x = 25,812.78 × 12,422.90
  4. Step 4: Simplify right side
    18,709.28x = 320,669,584.66
  5. Step 5: Solve for x
    x = 320,669,584.66/18,709.28
  6. Step 6: Final answer
    x = 17,139.60

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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.