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Finding the Fourth Proportional to 18,813.79, 28,200.78 and 6,959.94

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Solution

The fourth proportional to 18,813.79, 28,200.78 and 6,959.94 is: 10,432.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,813.79 : 28,200.78 = 6,959.94 : x
  2. Step 2: Convert to fraction form
    18,813.79/28,200.78 = 6,959.94/x
  3. Step 3: Cross multiply
    18,813.79x = 28,200.78 × 6,959.94
  4. Step 4: Simplify right side
    18,813.79x = 196,275,736.75
  5. Step 5: Solve for x
    x = 196,275,736.75/18,813.79
  6. Step 6: Final answer
    x = 10,432.55

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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.