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Finding the Fourth Proportional to 20,490.60, 30,734.68 and 7,162.66

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Solution

The fourth proportional to 20,490.60, 30,734.68 and 7,162.66 is: 10,743.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,490.60 : 30,734.68 = 7,162.66 : x
  2. Step 2: Convert to fraction form
    20,490.60/30,734.68 = 7,162.66/x
  3. Step 3: Cross multiply
    20,490.60x = 30,734.68 × 7,162.66
  4. Step 4: Simplify right side
    20,490.60x = 220,142,063.05
  5. Step 5: Solve for x
    x = 220,142,063.05/20,490.60
  6. Step 6: Final answer
    x = 10,743.56

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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.