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Finding the Fourth Proportional to 21,681.82, 29,919.27 and 12,251.26

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Solution

The fourth proportional to 21,681.82, 29,919.27 and 12,251.26 is: 16,905.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,681.82 : 29,919.27 = 12,251.26 : x
  2. Step 2: Convert to fraction form
    21,681.82/29,919.27 = 12,251.26/x
  3. Step 3: Cross multiply
    21,681.82x = 29,919.27 × 12,251.26
  4. Step 4: Simplify right side
    21,681.82x = 366,548,755.78
  5. Step 5: Solve for x
    x = 366,548,755.78/21,681.82
  6. Step 6: Final answer
    x = 16,905.81

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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.