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Finding the Fourth Proportional to 20,711.90, 31,071.90 and 8,229.80

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Solution

The fourth proportional to 20,711.90, 31,071.90 and 8,229.80 is: 12,346.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,711.90 : 31,071.90 = 8,229.80 : x
  2. Step 2: Convert to fraction form
    20,711.90/31,071.90 = 8,229.80/x
  3. Step 3: Cross multiply
    20,711.90x = 31,071.90 × 8,229.80
  4. Step 4: Simplify right side
    20,711.90x = 255,715,522.62
  5. Step 5: Solve for x
    x = 255,715,522.62/20,711.90
  6. Step 6: Final answer
    x = 12,346.31

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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.