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Finding the Fourth Proportional to 9,991.71, 13,788.47 and 5,515.65

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Solution

The fourth proportional to 9,991.71, 13,788.47 and 5,515.65 is: 7,611.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,991.71 : 13,788.47 = 5,515.65 : x
  2. Step 2: Convert to fraction form
    9,991.71/13,788.47 = 5,515.65/x
  3. Step 3: Cross multiply
    9,991.71x = 13,788.47 × 5,515.65
  4. Step 4: Simplify right side
    9,991.71x = 76,052,346.98
  5. Step 5: Solve for x
    x = 76,052,346.98/9,991.71
  6. Step 6: Final answer
    x = 7,611.54

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1.5x scale

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.