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Finding the Fourth Proportional to 18,668.60, 28,009.30 and 8,287.80

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Solution

The fourth proportional to 18,668.60, 28,009.30 and 8,287.80 is: 12,434.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,668.60 : 28,009.30 = 8,287.80 : x
  2. Step 2: Convert to fraction form
    18,668.60/28,009.30 = 8,287.80/x
  3. Step 3: Cross multiply
    18,668.60x = 28,009.30 × 8,287.80
  4. Step 4: Simplify right side
    18,668.60x = 232,135,476.54
  5. Step 5: Solve for x
    x = 232,135,476.54/18,668.60
  6. Step 6: Final answer
    x = 12,434.54

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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.