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Finding the Fourth Proportional to 18,613.70, 25,692.89 and 11,917.36

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Solution

The fourth proportional to 18,613.70, 25,692.89 and 11,917.36 is: 16,449.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,613.70 : 25,692.89 = 11,917.36 : x
  2. Step 2: Convert to fraction form
    18,613.70/25,692.89 = 11,917.36/x
  3. Step 3: Cross multiply
    18,613.70x = 25,692.89 × 11,917.36
  4. Step 4: Simplify right side
    18,613.70x = 306,191,295.75
  5. Step 5: Solve for x
    x = 306,191,295.75/18,613.70
  6. Step 6: Final answer
    x = 16,449.79

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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.