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Finding the Fourth Proportional to 7,781.88, 11,661.88 and 3,390.13

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Solution

The fourth proportional to 7,781.88, 11,661.88 and 3,390.13 is: 5,080.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,781.88 : 11,661.88 = 3,390.13 : x
  2. Step 2: Convert to fraction form
    7,781.88/11,661.88 = 3,390.13/x
  3. Step 3: Cross multiply
    7,781.88x = 11,661.88 × 3,390.13
  4. Step 4: Simplify right side
    7,781.88x = 39,535,289.24
  5. Step 5: Solve for x
    x = 39,535,289.24/7,781.88
  6. Step 6: Final answer
    x = 5,080.43

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