Home / 20,921.88-28,872.01-11,490.45

Finding the Fourth Proportional to 20,921.88, 28,872.01 and 11,490.45

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Solution

The fourth proportional to 20,921.88, 28,872.01 and 11,490.45 is: 15,856.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,921.88 : 28,872.01 = 11,490.45 : x
  2. Step 2: Convert to fraction form
    20,921.88/28,872.01 = 11,490.45/x
  3. Step 3: Cross multiply
    20,921.88x = 28,872.01 × 11,490.45
  4. Step 4: Simplify right side
    20,921.88x = 331,752,387.30
  5. Step 5: Solve for x
    x = 331,752,387.30/20,921.88
  6. Step 6: Final answer
    x = 15,856.72

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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.