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Finding the Fourth Proportional to 12,992.44, 17,929.74 and 7,687.12

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Solution

The fourth proportional to 12,992.44, 17,929.74 and 7,687.12 is: 10,608.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,992.44 : 17,929.74 = 7,687.12 : x
  2. Step 2: Convert to fraction form
    12,992.44/17,929.74 = 7,687.12/x
  3. Step 3: Cross multiply
    12,992.44x = 17,929.74 × 7,687.12
  4. Step 4: Simplify right side
    12,992.44x = 137,828,062.95
  5. Step 5: Solve for x
    x = 137,828,062.95/12,992.44
  6. Step 6: Final answer
    x = 10,608.33

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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.