Home / 20,439.90-28,195.50-12,873.21

Finding the Fourth Proportional to 20,439.90, 28,195.50 and 12,873.21

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Solution

The fourth proportional to 20,439.90, 28,195.50 and 12,873.21 is: 17,757.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,439.90 : 28,195.50 = 12,873.21 : x
  2. Step 2: Convert to fraction form
    20,439.90/28,195.50 = 12,873.21/x
  3. Step 3: Cross multiply
    20,439.90x = 28,195.50 × 12,873.21
  4. Step 4: Simplify right side
    20,439.90x = 362,966,592.56
  5. Step 5: Solve for x
    x = 362,966,592.56/20,439.90
  6. Step 6: Final answer
    x = 17,757.75

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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.