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Finding the Fourth Proportional to 12,940.88, 17,857.80 and 7,351.76

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Solution

The fourth proportional to 12,940.88, 17,857.80 and 7,351.76 is: 10,145.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,940.88 : 17,857.80 = 7,351.76 : x
  2. Step 2: Convert to fraction form
    12,940.88/17,857.80 = 7,351.76/x
  3. Step 3: Cross multiply
    12,940.88x = 17,857.80 × 7,351.76
  4. Step 4: Simplify right side
    12,940.88x = 131,286,259.73
  5. Step 5: Solve for x
    x = 131,286,259.73/12,940.88
  6. Step 6: Final answer
    x = 10,145.08

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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.