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Finding the Fourth Proportional to 19,881.67, 29,826.15 and 8,188.51

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Solution

The fourth proportional to 19,881.67, 29,826.15 and 8,188.51 is: 12,284.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,881.67 : 29,826.15 = 8,188.51 : x
  2. Step 2: Convert to fraction form
    19,881.67/29,826.15 = 8,188.51/x
  3. Step 3: Cross multiply
    19,881.67x = 29,826.15 × 8,188.51
  4. Step 4: Simplify right side
    19,881.67x = 244,231,727.54
  5. Step 5: Solve for x
    x = 244,231,727.54/19,881.67
  6. Step 6: Final answer
    x = 12,284.27

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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.