Home / 18,787.90-28,161.51-12,218.80

Finding the Fourth Proportional to 18,787.90, 28,161.51 and 12,218.80

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Solution

The fourth proportional to 18,787.90, 28,161.51 and 12,218.80 is: 18,314.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,787.90 : 28,161.51 = 12,218.80 : x
  2. Step 2: Convert to fraction form
    18,787.90/28,161.51 = 12,218.80/x
  3. Step 3: Cross multiply
    18,787.90x = 28,161.51 × 12,218.80
  4. Step 4: Simplify right side
    18,787.90x = 344,099,858.39
  5. Step 5: Solve for x
    x = 344,099,858.39/18,787.90
  6. Step 6: Final answer
    x = 18,314.97

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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.