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Finding the Fourth Proportional to 21,225.70, 31,839.60 and 8,079.09

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Solution

The fourth proportional to 21,225.70, 31,839.60 and 8,079.09 is: 12,119.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,225.70 : 31,839.60 = 8,079.09 : x
  2. Step 2: Convert to fraction form
    21,225.70/31,839.60 = 8,079.09/x
  3. Step 3: Cross multiply
    21,225.70x = 31,839.60 × 8,079.09
  4. Step 4: Simplify right side
    21,225.70x = 257,234,993.96
  5. Step 5: Solve for x
    x = 257,234,993.96/21,225.70
  6. Step 6: Final answer
    x = 12,119.03

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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.