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Finding the Fourth Proportional to 20,936.88, 28,891.08 and 11,503.08

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Solution

The fourth proportional to 20,936.88, 28,891.08 and 11,503.08 is: 15,873.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,936.88 : 28,891.08 = 11,503.08 : x
  2. Step 2: Convert to fraction form
    20,936.88/28,891.08 = 11,503.08/x
  3. Step 3: Cross multiply
    20,936.88x = 28,891.08 × 11,503.08
  4. Step 4: Simplify right side
    20,936.88x = 332,336,404.53
  5. Step 5: Solve for x
    x = 332,336,404.53/20,936.88
  6. Step 6: Final answer
    x = 15,873.25

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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.