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Finding the Fourth Proportional to 18,171.20, 27,256.80 and 12,612.80

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Solution

The fourth proportional to 18,171.20, 27,256.80 and 12,612.80 is: 18,919.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,171.20 : 27,256.80 = 12,612.80 : x
  2. Step 2: Convert to fraction form
    18,171.20/27,256.80 = 12,612.80/x
  3. Step 3: Cross multiply
    18,171.20x = 27,256.80 × 12,612.80
  4. Step 4: Simplify right side
    18,171.20x = 343,784,567.04
  5. Step 5: Solve for x
    x = 343,784,567.04/18,171.20
  6. Step 6: Final answer
    x = 18,919.20

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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.