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Finding the Fourth Proportional to 20,859.88, 28,787.06 and 11,427.88

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Solution

The fourth proportional to 20,859.88, 28,787.06 and 11,427.88 is: 15,770.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,859.88 : 28,787.06 = 11,427.88 : x
  2. Step 2: Convert to fraction form
    20,859.88/28,787.06 = 11,427.88/x
  3. Step 3: Cross multiply
    20,859.88x = 28,787.06 × 11,427.88
  4. Step 4: Simplify right side
    20,859.88x = 328,975,067.23
  5. Step 5: Solve for x
    x = 328,975,067.23/20,859.88
  6. Step 6: Final answer
    x = 15,770.71

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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.