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Finding the Fourth Proportional to 7,811.80, 11,718.44 and 2,189.47

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Solution

The fourth proportional to 7,811.80, 11,718.44 and 2,189.47 is: 3,284.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,811.80 : 11,718.44 = 2,189.47 : x
  2. Step 2: Convert to fraction form
    7,811.80/11,718.44 = 2,189.47/x
  3. Step 3: Cross multiply
    7,811.80x = 11,718.44 × 2,189.47
  4. Step 4: Simplify right side
    7,811.80x = 25,657,149.00
  5. Step 5: Solve for x
    x = 25,657,149.00/7,811.80
  6. Step 6: Final answer
    x = 3,284.41

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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.