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Finding the Fourth Proportional to 38,469.80, 57,720.90 and 18,738.20

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Solution

The fourth proportional to 38,469.80, 57,720.90 and 18,738.20 is: 28,115.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,469.80 : 57,720.90 = 18,738.20 : x
  2. Step 2: Convert to fraction form
    38,469.80/57,720.90 = 18,738.20/x
  3. Step 3: Cross multiply
    38,469.80x = 57,720.90 × 18,738.20
  4. Step 4: Simplify right side
    38,469.80x = 1,081,585,768.38
  5. Step 5: Solve for x
    x = 1,081,585,768.38/38,469.80
  6. Step 6: Final answer
    x = 28,115.19

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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.