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Finding the Fourth Proportional to 12,478.68, 17,222.13 and 8,000.79

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Solution

The fourth proportional to 12,478.68, 17,222.13 and 8,000.79 is: 11,042.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,478.68 : 17,222.13 = 8,000.79 : x
  2. Step 2: Convert to fraction form
    12,478.68/17,222.13 = 8,000.79/x
  3. Step 3: Cross multiply
    12,478.68x = 17,222.13 × 8,000.79
  4. Step 4: Simplify right side
    12,478.68x = 137,790,645.48
  5. Step 5: Solve for x
    x = 137,790,645.48/12,478.68
  6. Step 6: Final answer
    x = 11,042.09

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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.