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Finding the Fourth Proportional to 11,882.80, 17,818.80 and 5,311

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Solution

The fourth proportional to 11,882.80, 17,818.80 and 5,311 is: 7,964.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,882.80 : 17,818.80 = 5,311 : x
  2. Step 2: Convert to fraction form
    11,882.80/17,818.80 = 5,311/x
  3. Step 3: Cross multiply
    11,882.80x = 17,818.80 × 5,311
  4. Step 4: Simplify right side
    11,882.80x = 94,635,646.80
  5. Step 5: Solve for x
    x = 94,635,646.80/11,882.80
  6. Step 6: Final answer
    x = 7,964.09

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.