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Finding the Fourth Proportional to 18,914.94, 28,342.98 and 7,221.78

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Solution

The fourth proportional to 18,914.94, 28,342.98 and 7,221.78 is: 10,821.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,914.94 : 28,342.98 = 7,221.78 : x
  2. Step 2: Convert to fraction form
    18,914.94/28,342.98 = 7,221.78/x
  3. Step 3: Cross multiply
    18,914.94x = 28,342.98 × 7,221.78
  4. Step 4: Simplify right side
    18,914.94x = 204,686,766.10
  5. Step 5: Solve for x
    x = 204,686,766.10/18,914.94
  6. Step 6: Final answer
    x = 10,821.43

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1.5x scale

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.