Home / 9,991.78-13,788.66-5,515.54

Finding the Fourth Proportional to 9,991.78, 13,788.66 and 5,515.54

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Solution

The fourth proportional to 9,991.78, 13,788.66 and 5,515.54 is: 7,611.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,991.78 : 13,788.66 = 5,515.54 : x
  2. Step 2: Convert to fraction form
    9,991.78/13,788.66 = 5,515.54/x
  3. Step 3: Cross multiply
    9,991.78x = 13,788.66 × 5,515.54
  4. Step 4: Simplify right side
    9,991.78x = 76,051,905.78
  5. Step 5: Solve for x
    x = 76,051,905.78/9,991.78
  6. Step 6: Final answer
    x = 7,611.45

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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.