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Finding the Fourth Proportional to 20,572.82, 30,859.12 and 4,990.44

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Solution

The fourth proportional to 20,572.82, 30,859.12 and 4,990.44 is: 7,485.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,572.82 : 30,859.12 = 4,990.44 : x
  2. Step 2: Convert to fraction form
    20,572.82/30,859.12 = 4,990.44/x
  3. Step 3: Cross multiply
    20,572.82x = 30,859.12 × 4,990.44
  4. Step 4: Simplify right side
    20,572.82x = 154,000,586.81
  5. Step 5: Solve for x
    x = 154,000,586.81/20,572.82
  6. Step 6: Final answer
    x = 7,485.63

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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.