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Finding the Fourth Proportional to 12,486.15, 17,229.92 and 7,179.94

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Solution

The fourth proportional to 12,486.15, 17,229.92 and 7,179.94 is: 9,907.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,486.15 : 17,229.92 = 7,179.94 : x
  2. Step 2: Convert to fraction form
    12,486.15/17,229.92 = 7,179.94/x
  3. Step 3: Cross multiply
    12,486.15x = 17,229.92 × 7,179.94
  4. Step 4: Simplify right side
    12,486.15x = 123,709,777.44
  5. Step 5: Solve for x
    x = 123,709,777.44/12,486.15
  6. Step 6: Final answer
    x = 9,907.76

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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.