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Finding the Fourth Proportional to 8,780.31, 13,161.31 and 5,619.97

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Solution

The fourth proportional to 8,780.31, 13,161.31 and 5,619.97 is: 8,424.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,780.31 : 13,161.31 = 5,619.97 : x
  2. Step 2: Convert to fraction form
    8,780.31/13,161.31 = 5,619.97/x
  3. Step 3: Cross multiply
    8,780.31x = 13,161.31 × 5,619.97
  4. Step 4: Simplify right side
    8,780.31x = 73,966,167.36
  5. Step 5: Solve for x
    x = 73,966,167.36/8,780.31
  6. Step 6: Final answer
    x = 8,424.10

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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.