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Finding the Fourth Proportional to 13,318.74, 19,978.20 and 3,958.92

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Solution

The fourth proportional to 13,318.74, 19,978.20 and 3,958.92 is: 5,938.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,318.74 : 19,978.20 = 3,958.92 : x
  2. Step 2: Convert to fraction form
    13,318.74/19,978.20 = 3,958.92/x
  3. Step 3: Cross multiply
    13,318.74x = 19,978.20 × 3,958.92
  4. Step 4: Simplify right side
    13,318.74x = 79,092,095.54
  5. Step 5: Solve for x
    x = 79,092,095.54/13,318.74
  6. Step 6: Final answer
    x = 5,938.41

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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.