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Finding the Fourth Proportional to 18,489.60, 27,720.90 and 7,390.80

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Solution

The fourth proportional to 18,489.60, 27,720.90 and 7,390.80 is: 11,080.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,489.60 : 27,720.90 = 7,390.80 : x
  2. Step 2: Convert to fraction form
    18,489.60/27,720.90 = 7,390.80/x
  3. Step 3: Cross multiply
    18,489.60x = 27,720.90 × 7,390.80
  4. Step 4: Simplify right side
    18,489.60x = 204,879,627.72
  5. Step 5: Solve for x
    x = 204,879,627.72/18,489.60
  6. Step 6: Final answer
    x = 11,080.80

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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.