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Finding the Fourth Proportional to 12,161.33, 16,786.78 and 7,127.15

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Solution

The fourth proportional to 12,161.33, 16,786.78 and 7,127.15 is: 9,837.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,161.33 : 16,786.78 = 7,127.15 : x
  2. Step 2: Convert to fraction form
    12,161.33/16,786.78 = 7,127.15/x
  3. Step 3: Cross multiply
    12,161.33x = 16,786.78 × 7,127.15
  4. Step 4: Simplify right side
    12,161.33x = 119,641,899.08
  5. Step 5: Solve for x
    x = 119,641,899.08/12,161.33
  6. Step 6: Final answer
    x = 9,837.90

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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.