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Finding the Fourth Proportional to 18,986.80, 28,480.20 and 11,081.20

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Solution

The fourth proportional to 18,986.80, 28,480.20 and 11,081.20 is: 16,621.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,986.80 : 28,480.20 = 11,081.20 : x
  2. Step 2: Convert to fraction form
    18,986.80/28,480.20 = 11,081.20/x
  3. Step 3: Cross multiply
    18,986.80x = 28,480.20 × 11,081.20
  4. Step 4: Simplify right side
    18,986.80x = 315,594,792.24
  5. Step 5: Solve for x
    x = 315,594,792.24/18,986.80
  6. Step 6: Final answer
    x = 16,621.80

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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.