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Finding the Fourth Proportional to 11,081.78, 15,291.76 and 7,731.79

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Solution

The fourth proportional to 11,081.78, 15,291.76 and 7,731.79 is: 10,669.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,081.78 : 15,291.76 = 7,731.79 : x
  2. Step 2: Convert to fraction form
    11,081.78/15,291.76 = 7,731.79/x
  3. Step 3: Cross multiply
    11,081.78x = 15,291.76 × 7,731.79
  4. Step 4: Simplify right side
    11,081.78x = 118,232,720.00
  5. Step 5: Solve for x
    x = 118,232,720.00/11,081.78
  6. Step 6: Final answer
    x = 10,669.11

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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.