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Finding the Fourth Proportional to 18,738.22, 28,108.96 and 7,645.68

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Solution

The fourth proportional to 18,738.22, 28,108.96 and 7,645.68 is: 11,469.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,738.22 : 28,108.96 = 7,645.68 : x
  2. Step 2: Convert to fraction form
    18,738.22/28,108.96 = 7,645.68/x
  3. Step 3: Cross multiply
    18,738.22x = 28,108.96 × 7,645.68
  4. Step 4: Simplify right side
    18,738.22x = 214,912,113.29
  5. Step 5: Solve for x
    x = 214,912,113.29/18,738.22
  6. Step 6: Final answer
    x = 11,469.19

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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.