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Finding the Fourth Proportional to 12,992.80, 17,927.76 and 7,687.84

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Solution

The fourth proportional to 12,992.80, 17,927.76 and 7,687.84 is: 10,607.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,992.80 : 17,927.76 = 7,687.84 : x
  2. Step 2: Convert to fraction form
    12,992.80/17,927.76 = 7,687.84/x
  3. Step 3: Cross multiply
    12,992.80x = 17,927.76 × 7,687.84
  4. Step 4: Simplify right side
    12,992.80x = 137,825,750.44
  5. Step 5: Solve for x
    x = 137,825,750.44/12,992.80
  6. Step 6: Final answer
    x = 10,607.86

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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.