Home / 8,121.21-12,209.60-7,512.49

Finding the Fourth Proportional to 8,121.21, 12,209.60 and 7,512.49

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Solution

The fourth proportional to 8,121.21, 12,209.60 and 7,512.49 is: 11,294.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,121.21 : 12,209.60 = 7,512.49 : x
  2. Step 2: Convert to fraction form
    8,121.21/12,209.60 = 7,512.49/x
  3. Step 3: Cross multiply
    8,121.21x = 12,209.60 × 7,512.49
  4. Step 4: Simplify right side
    8,121.21x = 91,724,497.90
  5. Step 5: Solve for x
    x = 91,724,497.90/8,121.21
  6. Step 6: Final answer
    x = 11,294.44

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.