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Finding the Fourth Proportional to 21,691.68, 29,936.73 and 13,194.39

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Solution

The fourth proportional to 21,691.68, 29,936.73 and 13,194.39 is: 18,209.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,691.68 : 29,936.73 = 13,194.39 : x
  2. Step 2: Convert to fraction form
    21,691.68/29,936.73 = 13,194.39/x
  3. Step 3: Cross multiply
    21,691.68x = 29,936.73 × 13,194.39
  4. Step 4: Simplify right side
    21,691.68x = 394,996,770.47
  5. Step 5: Solve for x
    x = 394,996,770.47/21,691.68
  6. Step 6: Final answer
    x = 18,209.60

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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.