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Finding the Fourth Proportional to 12,940.61, 17,858.14 and 7,274.99

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Solution

The fourth proportional to 12,940.61, 17,858.14 and 7,274.99 is: 10,039.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,940.61 : 17,858.14 = 7,274.99 : x
  2. Step 2: Convert to fraction form
    12,940.61/17,858.14 = 7,274.99/x
  3. Step 3: Cross multiply
    12,940.61x = 17,858.14 × 7,274.99
  4. Step 4: Simplify right side
    12,940.61x = 129,917,816.38
  5. Step 5: Solve for x
    x = 129,917,816.38/12,940.61
  6. Step 6: Final answer
    x = 10,039.55

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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.