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Finding the Fourth Proportional to 18,875.44, 28,288.60 and 7,769.48

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Solution

The fourth proportional to 18,875.44, 28,288.60 and 7,769.48 is: 11,644.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,875.44 : 28,288.60 = 7,769.48 : x
  2. Step 2: Convert to fraction form
    18,875.44/28,288.60 = 7,769.48/x
  3. Step 3: Cross multiply
    18,875.44x = 28,288.60 × 7,769.48
  4. Step 4: Simplify right side
    18,875.44x = 219,787,711.93
  5. Step 5: Solve for x
    x = 219,787,711.93/18,875.44
  6. Step 6: Final answer
    x = 11,644.11

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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.