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Finding the Fourth Proportional to 20,620.76, 30,912.76 and 10,085.08

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Solution

The fourth proportional to 20,620.76, 30,912.76 and 10,085.08 is: 15,118.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,620.76 : 30,912.76 = 10,085.08 : x
  2. Step 2: Convert to fraction form
    20,620.76/30,912.76 = 10,085.08/x
  3. Step 3: Cross multiply
    20,620.76x = 30,912.76 × 10,085.08
  4. Step 4: Simplify right side
    20,620.76x = 311,757,657.62
  5. Step 5: Solve for x
    x = 311,757,657.62/20,620.76
  6. Step 6: Final answer
    x = 15,118.63

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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.