Home / 20,128.80-27,791.28-15,404.64

Finding the Fourth Proportional to 20,128.80, 27,791.28 and 15,404.64

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Solution

The fourth proportional to 20,128.80, 27,791.28 and 15,404.64 is: 21,268.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,128.80 : 27,791.28 = 15,404.64 : x
  2. Step 2: Convert to fraction form
    20,128.80/27,791.28 = 15,404.64/x
  3. Step 3: Cross multiply
    20,128.80x = 27,791.28 × 15,404.64
  4. Step 4: Simplify right side
    20,128.80x = 428,114,663.54
  5. Step 5: Solve for x
    x = 428,114,663.54/20,128.80
  6. Step 6: Final answer
    x = 21,268.76

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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.