Home / 13,138.28-18,130.83-8,422.56

Finding the Fourth Proportional to 13,138.28, 18,130.83 and 8,422.56

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Solution

The fourth proportional to 13,138.28, 18,130.83 and 8,422.56 is: 11,623.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,138.28 : 18,130.83 = 8,422.56 : x
  2. Step 2: Convert to fraction form
    13,138.28/18,130.83 = 8,422.56/x
  3. Step 3: Cross multiply
    13,138.28x = 18,130.83 × 8,422.56
  4. Step 4: Simplify right side
    13,138.28x = 152,708,027.80
  5. Step 5: Solve for x
    x = 152,708,027.80/13,138.28
  6. Step 6: Final answer
    x = 11,623.13

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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.