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Finding the Fourth Proportional to 12,405.69, 17,118.95 and 8,206.65

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Solution

The fourth proportional to 12,405.69, 17,118.95 and 8,206.65 is: 11,324.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,405.69 : 17,118.95 = 8,206.65 : x
  2. Step 2: Convert to fraction form
    12,405.69/17,118.95 = 8,206.65/x
  3. Step 3: Cross multiply
    12,405.69x = 17,118.95 × 8,206.65
  4. Step 4: Simplify right side
    12,405.69x = 140,489,189.98
  5. Step 5: Solve for x
    x = 140,489,189.98/12,405.69
  6. Step 6: Final answer
    x = 11,324.58

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1.5x scale

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.