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Finding the Fourth Proportional to 12,138.76, 18,209.12 and 3,373.68

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Solution

The fourth proportional to 12,138.76, 18,209.12 and 3,373.68 is: 5,060.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,138.76 : 18,209.12 = 3,373.68 : x
  2. Step 2: Convert to fraction form
    12,138.76/18,209.12 = 3,373.68/x
  3. Step 3: Cross multiply
    12,138.76x = 18,209.12 × 3,373.68
  4. Step 4: Simplify right side
    12,138.76x = 61,431,743.96
  5. Step 5: Solve for x
    x = 61,431,743.96/12,138.76
  6. Step 6: Final answer
    x = 5,060.79

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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.