Home / 12,120.40-18,181.50-8,839.90

Finding the Fourth Proportional to 12,120.40, 18,181.50 and 8,839.90

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Solution

The fourth proportional to 12,120.40, 18,181.50 and 8,839.90 is: 13,260.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,120.40 : 18,181.50 = 8,839.90 : x
  2. Step 2: Convert to fraction form
    12,120.40/18,181.50 = 8,839.90/x
  3. Step 3: Cross multiply
    12,120.40x = 18,181.50 × 8,839.90
  4. Step 4: Simplify right side
    12,120.40x = 160,722,641.85
  5. Step 5: Solve for x
    x = 160,722,641.85/12,120.40
  6. Step 6: Final answer
    x = 13,260.51

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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.