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Finding the Fourth Proportional to 15,881.80, 21,917.74 and 8,808.06

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Solution

The fourth proportional to 15,881.80, 21,917.74 and 8,808.06 is: 12,155.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,881.80 : 21,917.74 = 8,808.06 : x
  2. Step 2: Convert to fraction form
    15,881.80/21,917.74 = 8,808.06/x
  3. Step 3: Cross multiply
    15,881.80x = 21,917.74 × 8,808.06
  4. Step 4: Simplify right side
    15,881.80x = 193,052,768.98
  5. Step 5: Solve for x
    x = 193,052,768.98/15,881.80
  6. Step 6: Final answer
    x = 12,155.60

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Why These Related Problems?

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