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Finding the Fourth Proportional to 18,928.86, 26,121.86 and 11,375.30

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Solution

The fourth proportional to 18,928.86, 26,121.86 and 11,375.30 is: 15,697.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,928.86 : 26,121.86 = 11,375.30 : x
  2. Step 2: Convert to fraction form
    18,928.86/26,121.86 = 11,375.30/x
  3. Step 3: Cross multiply
    18,928.86x = 26,121.86 × 11,375.30
  4. Step 4: Simplify right side
    18,928.86x = 297,144,045.14
  5. Step 5: Solve for x
    x = 297,144,045.14/18,928.86
  6. Step 6: Final answer
    x = 15,697.94

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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.