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Finding the Fourth Proportional to 20,164.60, 30,246.90 and 12,728.80

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Solution

The fourth proportional to 20,164.60, 30,246.90 and 12,728.80 is: 19,093.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,164.60 : 30,246.90 = 12,728.80 : x
  2. Step 2: Convert to fraction form
    20,164.60/30,246.90 = 12,728.80/x
  3. Step 3: Cross multiply
    20,164.60x = 30,246.90 × 12,728.80
  4. Step 4: Simplify right side
    20,164.60x = 385,006,740.72
  5. Step 5: Solve for x
    x = 385,006,740.72/20,164.60
  6. Step 6: Final answer
    x = 19,093.20

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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.