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Finding the Fourth Proportional to 18,919.76, 26,081.99 and 13,236.90

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Solution

The fourth proportional to 18,919.76, 26,081.99 and 13,236.90 is: 18,247.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,919.76 : 26,081.99 = 13,236.90 : x
  2. Step 2: Convert to fraction form
    18,919.76/26,081.99 = 13,236.90/x
  3. Step 3: Cross multiply
    18,919.76x = 26,081.99 × 13,236.90
  4. Step 4: Simplify right side
    18,919.76x = 345,244,693.43
  5. Step 5: Solve for x
    x = 345,244,693.43/18,919.76
  6. Step 6: Final answer
    x = 18,247.84

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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.