Home / 20,921.78-28,873.60-12,965.56

Finding the Fourth Proportional to 20,921.78, 28,873.60 and 12,965.56

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Solution

The fourth proportional to 20,921.78, 28,873.60 and 12,965.56 is: 17,893.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,921.78 : 28,873.60 = 12,965.56 : x
  2. Step 2: Convert to fraction form
    20,921.78/28,873.60 = 12,965.56/x
  3. Step 3: Cross multiply
    20,921.78x = 28,873.60 × 12,965.56
  4. Step 4: Simplify right side
    20,921.78x = 374,362,393.22
  5. Step 5: Solve for x
    x = 374,362,393.22/20,921.78
  6. Step 6: Final answer
    x = 17,893.43

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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.