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Finding the Fourth Proportional to 18,919.51, 26,081.65 and 13,236.65

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Solution

The fourth proportional to 18,919.51, 26,081.65 and 13,236.65 is: 18,247.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,919.51 : 26,081.65 = 13,236.65 : x
  2. Step 2: Convert to fraction form
    18,919.51/26,081.65 = 13,236.65/x
  3. Step 3: Cross multiply
    18,919.51x = 26,081.65 × 13,236.65
  4. Step 4: Simplify right side
    18,919.51x = 345,233,704.58
  5. Step 5: Solve for x
    x = 345,233,704.58/18,919.51
  6. Step 6: Final answer
    x = 18,247.50

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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.