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Finding the Fourth Proportional to 18,789.79, 28,185.02 and 6,781.46

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Solution

The fourth proportional to 18,789.79, 28,185.02 and 6,781.46 is: 10,172.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,789.79 : 28,185.02 = 6,781.46 : x
  2. Step 2: Convert to fraction form
    18,789.79/28,185.02 = 6,781.46/x
  3. Step 3: Cross multiply
    18,789.79x = 28,185.02 × 6,781.46
  4. Step 4: Simplify right side
    18,789.79x = 191,135,474.47
  5. Step 5: Solve for x
    x = 191,135,474.47/18,789.79
  6. Step 6: Final answer
    x = 10,172.31

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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.