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Finding the Fourth Proportional to 12,661.20, 17,472.44 and 7,072.20

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Solution

The fourth proportional to 12,661.20, 17,472.44 and 7,072.20 is: 9,759.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,661.20 : 17,472.44 = 7,072.20 : x
  2. Step 2: Convert to fraction form
    12,661.20/17,472.44 = 7,072.20/x
  3. Step 3: Cross multiply
    12,661.20x = 17,472.44 × 7,072.20
  4. Step 4: Simplify right side
    12,661.20x = 123,568,590.17
  5. Step 5: Solve for x
    x = 123,568,590.17/12,661.20
  6. Step 6: Final answer
    x = 9,759.63

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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.