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Finding the Fourth Proportional to 18,861.48, 28,267.62 and 7,755.48

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Solution

The fourth proportional to 18,861.48, 28,267.62 and 7,755.48 is: 11,623.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,861.48 : 28,267.62 = 7,755.48 : x
  2. Step 2: Convert to fraction form
    18,861.48/28,267.62 = 7,755.48/x
  3. Step 3: Cross multiply
    18,861.48x = 28,267.62 × 7,755.48
  4. Step 4: Simplify right side
    18,861.48x = 219,228,961.56
  5. Step 5: Solve for x
    x = 219,228,961.56/18,861.48
  6. Step 6: Final answer
    x = 11,623.10

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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.