Home / 12,139.20-18,175.20-11,220.48

Finding the Fourth Proportional to 12,139.20, 18,175.20 and 11,220.48

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Solution

The fourth proportional to 12,139.20, 18,175.20 and 11,220.48 is: 16,799.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,139.20 : 18,175.20 = 11,220.48 : x
  2. Step 2: Convert to fraction form
    12,139.20/18,175.20 = 11,220.48/x
  3. Step 3: Cross multiply
    12,139.20x = 18,175.20 × 11,220.48
  4. Step 4: Simplify right side
    12,139.20x = 203,934,468.10
  5. Step 5: Solve for x
    x = 203,934,468.10/12,139.20
  6. Step 6: Final answer
    x = 16,799.66

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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.