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Finding the Fourth Proportional to 20,989.92, 31,483.82 and 7,841.29

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Solution

The fourth proportional to 20,989.92, 31,483.82 and 7,841.29 is: 11,761.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,989.92 : 31,483.82 = 7,841.29 : x
  2. Step 2: Convert to fraction form
    20,989.92/31,483.82 = 7,841.29/x
  3. Step 3: Cross multiply
    20,989.92x = 31,483.82 × 7,841.29
  4. Step 4: Simplify right side
    20,989.92x = 246,873,762.93
  5. Step 5: Solve for x
    x = 246,873,762.93/20,989.92
  6. Step 6: Final answer
    x = 11,761.54

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.