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Finding the Fourth Proportional to 18,755.75, 25,856.22 and 12,779.75

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Solution

The fourth proportional to 18,755.75, 25,856.22 and 12,779.75 is: 17,617.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,755.75 : 25,856.22 = 12,779.75 : x
  2. Step 2: Convert to fraction form
    18,755.75/25,856.22 = 12,779.75/x
  3. Step 3: Cross multiply
    18,755.75x = 25,856.22 × 12,779.75
  4. Step 4: Simplify right side
    18,755.75x = 330,436,027.55
  5. Step 5: Solve for x
    x = 330,436,027.55/18,755.75
  6. Step 6: Final answer
    x = 17,617.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.