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Finding the Fourth Proportional to 20,215.35, 30,321.99 and 7,741.35

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Solution

The fourth proportional to 20,215.35, 30,321.99 and 7,741.35 is: 11,611.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,215.35 : 30,321.99 = 7,741.35 : x
  2. Step 2: Convert to fraction form
    20,215.35/30,321.99 = 7,741.35/x
  3. Step 3: Cross multiply
    20,215.35x = 30,321.99 × 7,741.35
  4. Step 4: Simplify right side
    20,215.35x = 234,733,137.29
  5. Step 5: Solve for x
    x = 234,733,137.29/20,215.35
  6. Step 6: Final answer
    x = 11,611.63

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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.