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Finding the Fourth Proportional to 21,690.63, 32,540.63 and 12,335.13

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Solution

The fourth proportional to 21,690.63, 32,540.63 and 12,335.13 is: 18,505.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,690.63 : 32,540.63 = 12,335.13 : x
  2. Step 2: Convert to fraction form
    21,690.63/32,540.63 = 12,335.13/x
  3. Step 3: Cross multiply
    21,690.63x = 32,540.63 × 12,335.13
  4. Step 4: Simplify right side
    21,690.63x = 401,392,839.66
  5. Step 5: Solve for x
    x = 401,392,839.66/21,690.63
  6. Step 6: Final answer
    x = 18,505.36

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.