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Finding the Fourth Proportional to 18,979.60, 28,469.40 and 18,115.60

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Solution

The fourth proportional to 18,979.60, 28,469.40 and 18,115.60 is: 27,173.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,979.60 : 28,469.40 = 18,115.60 : x
  2. Step 2: Convert to fraction form
    18,979.60/28,469.40 = 18,115.60/x
  3. Step 3: Cross multiply
    18,979.60x = 28,469.40 × 18,115.60
  4. Step 4: Simplify right side
    18,979.60x = 515,740,262.64
  5. Step 5: Solve for x
    x = 515,740,262.64/18,979.60
  6. Step 6: Final answer
    x = 27,173.40

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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.