Home / 20,179.20-30,196.80-12,787.20

Finding the Fourth Proportional to 20,179.20, 30,196.80 and 12,787.20

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Solution

The fourth proportional to 20,179.20, 30,196.80 and 12,787.20 is: 19,135.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,179.20 : 30,196.80 = 12,787.20 : x
  2. Step 2: Convert to fraction form
    20,179.20/30,196.80 = 12,787.20/x
  3. Step 3: Cross multiply
    20,179.20x = 30,196.80 × 12,787.20
  4. Step 4: Simplify right side
    20,179.20x = 386,132,520.96
  5. Step 5: Solve for x
    x = 386,132,520.96/20,179.20
  6. Step 6: Final answer
    x = 19,135.17

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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.