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Finding the Fourth Proportional to 18,512.60, 27,768.90 and 14,138.60

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Solution

The fourth proportional to 18,512.60, 27,768.90 and 14,138.60 is: 21,207.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,512.60 : 27,768.90 = 14,138.60 : x
  2. Step 2: Convert to fraction form
    18,512.60/27,768.90 = 14,138.60/x
  3. Step 3: Cross multiply
    18,512.60x = 27,768.90 × 14,138.60
  4. Step 4: Simplify right side
    18,512.60x = 392,613,369.54
  5. Step 5: Solve for x
    x = 392,613,369.54/18,512.60
  6. Step 6: Final answer
    x = 21,207.90

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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.