Home / 12,108.80-18,138.90-8,172.20

Finding the Fourth Proportional to 12,108.80, 18,138.90 and 8,172.20

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Solution

The fourth proportional to 12,108.80, 18,138.90 and 8,172.20 is: 12,241.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,108.80 : 18,138.90 = 8,172.20 : x
  2. Step 2: Convert to fraction form
    12,108.80/18,138.90 = 8,172.20/x
  3. Step 3: Cross multiply
    12,108.80x = 18,138.90 × 8,172.20
  4. Step 4: Simplify right side
    12,108.80x = 148,234,718.58
  5. Step 5: Solve for x
    x = 148,234,718.58/12,108.80
  6. Step 6: Final answer
    x = 12,241.90

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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.