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Finding the Fourth Proportional to 18,988.56, 28,480.60 and 11,947.80

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Solution

The fourth proportional to 18,988.56, 28,480.60 and 11,947.80 is: 17,920.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,988.56 : 28,480.60 = 11,947.80 : x
  2. Step 2: Convert to fraction form
    18,988.56/28,480.60 = 11,947.80/x
  3. Step 3: Cross multiply
    18,988.56x = 28,480.60 × 11,947.80
  4. Step 4: Simplify right side
    18,988.56x = 340,280,512.68
  5. Step 5: Solve for x
    x = 340,280,512.68/18,988.56
  6. Step 6: Final answer
    x = 17,920.29

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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.