Home / 20,787.20-31,180.80-8,309.15

Finding the Fourth Proportional to 20,787.20, 31,180.80 and 8,309.15

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Solution

The fourth proportional to 20,787.20, 31,180.80 and 8,309.15 is: 12,463.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,787.20 : 31,180.80 = 8,309.15 : x
  2. Step 2: Convert to fraction form
    20,787.20/31,180.80 = 8,309.15/x
  3. Step 3: Cross multiply
    20,787.20x = 31,180.80 × 8,309.15
  4. Step 4: Simplify right side
    20,787.20x = 259,085,944.32
  5. Step 5: Solve for x
    x = 259,085,944.32/20,787.20
  6. Step 6: Final answer
    x = 12,463.73

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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.