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Finding the Fourth Proportional to 20,778.80, 31,168.20 and 8,466.80

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Solution

The fourth proportional to 20,778.80, 31,168.20 and 8,466.80 is: 12,700.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,778.80 : 31,168.20 = 8,466.80 : x
  2. Step 2: Convert to fraction form
    20,778.80/31,168.20 = 8,466.80/x
  3. Step 3: Cross multiply
    20,778.80x = 31,168.20 × 8,466.80
  4. Step 4: Simplify right side
    20,778.80x = 263,894,915.76
  5. Step 5: Solve for x
    x = 263,894,915.76/20,778.80
  6. Step 6: Final answer
    x = 12,700.20

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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.