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Finding the Fourth Proportional to 20,791.58, 28,688.91 and 11,839.22

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Solution

The fourth proportional to 20,791.58, 28,688.91 and 11,839.22 is: 16,336.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,791.58 : 28,688.91 = 11,839.22 : x
  2. Step 2: Convert to fraction form
    20,791.58/28,688.91 = 11,839.22/x
  3. Step 3: Cross multiply
    20,791.58x = 28,688.91 × 11,839.22
  4. Step 4: Simplify right side
    20,791.58x = 339,654,317.05
  5. Step 5: Solve for x
    x = 339,654,317.05/20,791.58
  6. Step 6: Final answer
    x = 16,336.15

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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.