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Finding the Fourth Proportional to 21,039.90, 31,559.90 and 8,551.11

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Solution

The fourth proportional to 21,039.90, 31,559.90 and 8,551.11 is: 12,826.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,039.90 : 31,559.90 = 8,551.11 : x
  2. Step 2: Convert to fraction form
    21,039.90/31,559.90 = 8,551.11/x
  3. Step 3: Cross multiply
    21,039.90x = 31,559.90 × 8,551.11
  4. Step 4: Simplify right side
    21,039.90x = 269,872,252.08
  5. Step 5: Solve for x
    x = 269,872,252.08/21,039.90
  6. Step 6: Final answer
    x = 12,826.69

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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.