Home / 20,921.87-28,872.69-11,490.64

Finding the Fourth Proportional to 20,921.87, 28,872.69 and 11,490.64

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Solution

The fourth proportional to 20,921.87, 28,872.69 and 11,490.64 is: 15,857.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,921.87 : 28,872.69 = 11,490.64 : x
  2. Step 2: Convert to fraction form
    20,921.87/28,872.69 = 11,490.64/x
  3. Step 3: Cross multiply
    20,921.87x = 28,872.69 × 11,490.64
  4. Step 4: Simplify right side
    20,921.87x = 331,765,571.35
  5. Step 5: Solve for x
    x = 331,765,571.35/20,921.87
  6. Step 6: Final answer
    x = 15,857.36

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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.