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Finding the Fourth Proportional to 12,209.50, 16,849.11 and 6,620.50

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Solution

The fourth proportional to 12,209.50, 16,849.11 and 6,620.50 is: 9,136.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,209.50 : 16,849.11 = 6,620.50 : x
  2. Step 2: Convert to fraction form
    12,209.50/16,849.11 = 6,620.50/x
  3. Step 3: Cross multiply
    12,209.50x = 16,849.11 × 6,620.50
  4. Step 4: Simplify right side
    12,209.50x = 111,549,532.76
  5. Step 5: Solve for x
    x = 111,549,532.76/12,209.50
  6. Step 6: Final answer
    x = 9,136.29

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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.