Home / 20,857.10-28,756.96-13,772.30

Finding the Fourth Proportional to 20,857.10, 28,756.96 and 13,772.30

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Solution

The fourth proportional to 20,857.10, 28,756.96 and 13,772.30 is: 18,988.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,857.10 : 28,756.96 = 13,772.30 : x
  2. Step 2: Convert to fraction form
    20,857.10/28,756.96 = 13,772.30/x
  3. Step 3: Cross multiply
    20,857.10x = 28,756.96 × 13,772.30
  4. Step 4: Simplify right side
    20,857.10x = 396,049,301.99
  5. Step 5: Solve for x
    x = 396,049,301.99/20,857.10
  6. Step 6: Final answer
    x = 18,988.71

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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.