Home / 11,078.40-15,270.21-9,639.09

Finding the Fourth Proportional to 11,078.40, 15,270.21 and 9,639.09

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Solution

The fourth proportional to 11,078.40, 15,270.21 and 9,639.09 is: 13,286.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,078.40 : 15,270.21 = 9,639.09 : x
  2. Step 2: Convert to fraction form
    11,078.40/15,270.21 = 9,639.09/x
  3. Step 3: Cross multiply
    11,078.40x = 15,270.21 × 9,639.09
  4. Step 4: Simplify right side
    11,078.40x = 147,190,928.51
  5. Step 5: Solve for x
    x = 147,190,928.51/11,078.40
  6. Step 6: Final answer
    x = 13,286.30

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.