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Finding the Fourth Proportional to 15,854.01, 21,879.78 and 8,781.09

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Solution

The fourth proportional to 15,854.01, 21,879.78 and 8,781.09 is: 12,118.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,854.01 : 21,879.78 = 8,781.09 : x
  2. Step 2: Convert to fraction form
    15,854.01/21,879.78 = 8,781.09/x
  3. Step 3: Cross multiply
    15,854.01x = 21,879.78 × 8,781.09
  4. Step 4: Simplify right side
    15,854.01x = 192,128,317.36
  5. Step 5: Solve for x
    x = 192,128,317.36/15,854.01
  6. Step 6: Final answer
    x = 12,118.59

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.