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Finding the Fourth Proportional to 20,807.11, 28,713.82 and 11,375.68

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Solution

The fourth proportional to 20,807.11, 28,713.82 and 11,375.68 is: 15,698.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,807.11 : 28,713.82 = 11,375.68 : x
  2. Step 2: Convert to fraction form
    20,807.11/28,713.82 = 11,375.68/x
  3. Step 3: Cross multiply
    20,807.11x = 28,713.82 × 11,375.68
  4. Step 4: Simplify right side
    20,807.11x = 326,639,027.45
  5. Step 5: Solve for x
    x = 326,639,027.45/20,807.11
  6. Step 6: Final answer
    x = 15,698.43

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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.