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Finding the Fourth Proportional to 9,991.65, 13,788.48 and 5,515.41

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Solution

The fourth proportional to 9,991.65, 13,788.48 and 5,515.41 is: 7,611.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,991.65 : 13,788.48 = 5,515.41 : x
  2. Step 2: Convert to fraction form
    9,991.65/13,788.48 = 5,515.41/x
  3. Step 3: Cross multiply
    9,991.65x = 13,788.48 × 5,515.41
  4. Step 4: Simplify right side
    9,991.65x = 76,049,065.32
  5. Step 5: Solve for x
    x = 76,049,065.32/9,991.65
  6. Step 6: Final answer
    x = 7,611.26

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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.