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Finding the Fourth Proportional to 18,140.80, 27,211.20 and 11,579.80

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Solution

The fourth proportional to 18,140.80, 27,211.20 and 11,579.80 is: 17,369.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,140.80 : 27,211.20 = 11,579.80 : x
  2. Step 2: Convert to fraction form
    18,140.80/27,211.20 = 11,579.80/x
  3. Step 3: Cross multiply
    18,140.80x = 27,211.20 × 11,579.80
  4. Step 4: Simplify right side
    18,140.80x = 315,100,253.76
  5. Step 5: Solve for x
    x = 315,100,253.76/18,140.80
  6. Step 6: Final answer
    x = 17,369.70

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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.