Home / 20,921.75-28,872.23-11,490.52

Finding the Fourth Proportional to 20,921.75, 28,872.23 and 11,490.52

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Solution

The fourth proportional to 20,921.75, 28,872.23 and 11,490.52 is: 15,857.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,921.75 : 28,872.23 = 11,490.52 : x
  2. Step 2: Convert to fraction form
    20,921.75/28,872.23 = 11,490.52/x
  3. Step 3: Cross multiply
    20,921.75x = 28,872.23 × 11,490.52
  4. Step 4: Simplify right side
    20,921.75x = 331,756,936.26
  5. Step 5: Solve for x
    x = 331,756,936.26/20,921.75
  6. Step 6: Final answer
    x = 15,857.04

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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.