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Finding the Fourth Proportional to 21,422.52, 29,563.08 and 11,991

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Solution

The fourth proportional to 21,422.52, 29,563.08 and 11,991 is: 16,547.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,422.52 : 29,563.08 = 11,991 : x
  2. Step 2: Convert to fraction form
    21,422.52/29,563.08 = 11,991/x
  3. Step 3: Cross multiply
    21,422.52x = 29,563.08 × 11,991
  4. Step 4: Simplify right side
    21,422.52x = 354,490,892.28
  5. Step 5: Solve for x
    x = 354,490,892.28/21,422.52
  6. Step 6: Final answer
    x = 16,547.58

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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.