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Finding the Fourth Proportional to 9,991.54, 13,788.93 and 5,515.27

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Solution

The fourth proportional to 9,991.54, 13,788.93 and 5,515.27 is: 7,611.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,991.54 : 13,788.93 = 5,515.27 : x
  2. Step 2: Convert to fraction form
    9,991.54/13,788.93 = 5,515.27/x
  3. Step 3: Cross multiply
    9,991.54x = 13,788.93 × 5,515.27
  4. Step 4: Simplify right side
    9,991.54x = 76,049,671.96
  5. Step 5: Solve for x
    x = 76,049,671.96/9,991.54
  6. Step 6: Final answer
    x = 7,611.41

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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.