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Finding the Fourth Proportional to 12,879.80, 17,772.92 and 7,290.80

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Solution

The fourth proportional to 12,879.80, 17,772.92 and 7,290.80 is: 10,060.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,879.80 : 17,772.92 = 7,290.80 : x
  2. Step 2: Convert to fraction form
    12,879.80/17,772.92 = 7,290.80/x
  3. Step 3: Cross multiply
    12,879.80x = 17,772.92 × 7,290.80
  4. Step 4: Simplify right side
    12,879.80x = 129,578,805.14
  5. Step 5: Solve for x
    x = 129,578,805.14/12,879.80
  6. Step 6: Final answer
    x = 10,060.62

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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.