Home / 12,128.40-18,195.60-5,553.20

Finding the Fourth Proportional to 12,128.40, 18,195.60 and 5,553.20

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Solution

The fourth proportional to 12,128.40, 18,195.60 and 5,553.20 is: 8,331.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,128.40 : 18,195.60 = 5,553.20 : x
  2. Step 2: Convert to fraction form
    12,128.40/18,195.60 = 5,553.20/x
  3. Step 3: Cross multiply
    12,128.40x = 18,195.60 × 5,553.20
  4. Step 4: Simplify right side
    12,128.40x = 101,043,805.92
  5. Step 5: Solve for x
    x = 101,043,805.92/12,128.40
  6. Step 6: Final answer
    x = 8,331.17

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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.