Home / 13,725.20-18,939.24-10,000.40

Finding the Fourth Proportional to 13,725.20, 18,939.24 and 10,000.40

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Solution

The fourth proportional to 13,725.20, 18,939.24 and 10,000.40 is: 13,799.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,725.20 : 18,939.24 = 10,000.40 : x
  2. Step 2: Convert to fraction form
    13,725.20/18,939.24 = 10,000.40/x
  3. Step 3: Cross multiply
    13,725.20x = 18,939.24 × 10,000.40
  4. Step 4: Simplify right side
    13,725.20x = 189,399,975.70
  5. Step 5: Solve for x
    x = 189,399,975.70/13,725.20
  6. Step 6: Final answer
    x = 13,799.43

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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.