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Finding the Fourth Proportional to 21,411.22, 32,119.91 and 6,621.43

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Solution

The fourth proportional to 21,411.22, 32,119.91 and 6,621.43 is: 9,933.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,411.22 : 32,119.91 = 6,621.43 : x
  2. Step 2: Convert to fraction form
    21,411.22/32,119.91 = 6,621.43/x
  3. Step 3: Cross multiply
    21,411.22x = 32,119.91 × 6,621.43
  4. Step 4: Simplify right side
    21,411.22x = 212,679,735.67
  5. Step 5: Solve for x
    x = 212,679,735.67/21,411.22
  6. Step 6: Final answer
    x = 9,933.10

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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.