Home / 9,991.21-13,787.91-5,515

Finding the Fourth Proportional to 9,991.21, 13,787.91 and 5,515

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Solution

The fourth proportional to 9,991.21, 13,787.91 and 5,515 is: 7,610.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,991.21 : 13,787.91 = 5,515 : x
  2. Step 2: Convert to fraction form
    9,991.21/13,787.91 = 5,515/x
  3. Step 3: Cross multiply
    9,991.21x = 13,787.91 × 5,515
  4. Step 4: Simplify right side
    9,991.21x = 76,040,323.65
  5. Step 5: Solve for x
    x = 76,040,323.65/9,991.21
  6. Step 6: Final answer
    x = 7,610.72

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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.