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Finding the Fourth Proportional to 18,761.47, 28,142.25 and 7,668.19

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Solution

The fourth proportional to 18,761.47, 28,142.25 and 7,668.19 is: 11,502.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,761.47 : 28,142.25 = 7,668.19 : x
  2. Step 2: Convert to fraction form
    18,761.47/28,142.25 = 7,668.19/x
  3. Step 3: Cross multiply
    18,761.47x = 28,142.25 × 7,668.19
  4. Step 4: Simplify right side
    18,761.47x = 215,800,120.03
  5. Step 5: Solve for x
    x = 215,800,120.03/18,761.47
  6. Step 6: Final answer
    x = 11,502.30

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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.