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Finding the Fourth Proportional to 20,918.71, 28,866.03 and 11,964.78

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Solution

The fourth proportional to 20,918.71, 28,866.03 and 11,964.78 is: 16,510.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,918.71 : 28,866.03 = 11,964.78 : x
  2. Step 2: Convert to fraction form
    20,918.71/28,866.03 = 11,964.78/x
  3. Step 3: Cross multiply
    20,918.71x = 28,866.03 × 11,964.78
  4. Step 4: Simplify right side
    20,918.71x = 345,375,698.42
  5. Step 5: Solve for x
    x = 345,375,698.42/20,918.71
  6. Step 6: Final answer
    x = 16,510.37

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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.