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Finding the Fourth Proportional to 11,781.66, 17,672.03 and 3,990.47

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Solution

The fourth proportional to 11,781.66, 17,672.03 and 3,990.47 is: 5,985.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,781.66 : 17,672.03 = 3,990.47 : x
  2. Step 2: Convert to fraction form
    11,781.66/17,672.03 = 3,990.47/x
  3. Step 3: Cross multiply
    11,781.66x = 17,672.03 × 3,990.47
  4. Step 4: Simplify right side
    11,781.66x = 70,519,685.60
  5. Step 5: Solve for x
    x = 70,519,685.60/11,781.66
  6. Step 6: Final answer
    x = 5,985.55

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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.