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Finding the Fourth Proportional to 18,959.86, 28,440.20 and 5,811.94

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Solution

The fourth proportional to 18,959.86, 28,440.20 and 5,811.94 is: 8,718.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,959.86 : 28,440.20 = 5,811.94 : x
  2. Step 2: Convert to fraction form
    18,959.86/28,440.20 = 5,811.94/x
  3. Step 3: Cross multiply
    18,959.86x = 28,440.20 × 5,811.94
  4. Step 4: Simplify right side
    18,959.86x = 165,292,735.99
  5. Step 5: Solve for x
    x = 165,292,735.99/18,959.86
  6. Step 6: Final answer
    x = 8,718.04

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.