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Finding the Fourth Proportional to 21,990.76, 32,991.56 and 6,408.52

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Solution

The fourth proportional to 21,990.76, 32,991.56 and 6,408.52 is: 9,614.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,990.76 : 32,991.56 = 6,408.52 : x
  2. Step 2: Convert to fraction form
    21,990.76/32,991.56 = 6,408.52/x
  3. Step 3: Cross multiply
    21,990.76x = 32,991.56 × 6,408.52
  4. Step 4: Simplify right side
    21,990.76x = 211,427,072.09
  5. Step 5: Solve for x
    x = 211,427,072.09/21,990.76
  6. Step 6: Final answer
    x = 9,614.36

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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.