Home / 18,961.12-28,443.20-5,109.92

Finding the Fourth Proportional to 18,961.12, 28,443.20 and 5,109.92

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Solution

The fourth proportional to 18,961.12, 28,443.20 and 5,109.92 is: 7,665.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,961.12 : 28,443.20 = 5,109.92 : x
  2. Step 2: Convert to fraction form
    18,961.12/28,443.20 = 5,109.92/x
  3. Step 3: Cross multiply
    18,961.12x = 28,443.20 × 5,109.92
  4. Step 4: Simplify right side
    18,961.12x = 145,342,476.54
  5. Step 5: Solve for x
    x = 145,342,476.54/18,961.12
  6. Step 6: Final answer
    x = 7,665.29

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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.