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Finding the Fourth Proportional to 18,912.25, 28,339.10 and 12,991.97

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Solution

The fourth proportional to 18,912.25, 28,339.10 and 12,991.97 is: 19,467.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,912.25 : 28,339.10 = 12,991.97 : x
  2. Step 2: Convert to fraction form
    18,912.25/28,339.10 = 12,991.97/x
  3. Step 3: Cross multiply
    18,912.25x = 28,339.10 × 12,991.97
  4. Step 4: Simplify right side
    18,912.25x = 368,180,672.07
  5. Step 5: Solve for x
    x = 368,180,672.07/18,912.25
  6. Step 6: Final answer
    x = 19,467.85

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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.