Home / 20,142.80-27,810.60-15,418.64

Finding the Fourth Proportional to 20,142.80, 27,810.60 and 15,418.64

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Solution

The fourth proportional to 20,142.80, 27,810.60 and 15,418.64 is: 21,288.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,142.80 : 27,810.60 = 15,418.64 : x
  2. Step 2: Convert to fraction form
    20,142.80/27,810.60 = 15,418.64/x
  3. Step 3: Cross multiply
    20,142.80x = 27,810.60 × 15,418.64
  4. Step 4: Simplify right side
    20,142.80x = 428,801,629.58
  5. Step 5: Solve for x
    x = 428,801,629.58/20,142.80
  6. Step 6: Final answer
    x = 21,288.08

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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.