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Finding the Fourth Proportional to 12,155.45, 18,233.16 and 3,947.45

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Solution

The fourth proportional to 12,155.45, 18,233.16 and 3,947.45 is: 5,921.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,155.45 : 18,233.16 = 3,947.45 : x
  2. Step 2: Convert to fraction form
    12,155.45/18,233.16 = 3,947.45/x
  3. Step 3: Cross multiply
    12,155.45x = 18,233.16 × 3,947.45
  4. Step 4: Simplify right side
    12,155.45x = 71,974,396.28
  5. Step 5: Solve for x
    x = 71,974,396.28/12,155.45
  6. Step 6: Final answer
    x = 5,921.17

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Similar ratio
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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.