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Finding the Fourth Proportional to 20,673.20, 30,975.60 and 11,892.80

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Solution

The fourth proportional to 20,673.20, 30,975.60 and 11,892.80 is: 17,819.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,673.20 : 30,975.60 = 11,892.80 : x
  2. Step 2: Convert to fraction form
    20,673.20/30,975.60 = 11,892.80/x
  3. Step 3: Cross multiply
    20,673.20x = 30,975.60 × 11,892.80
  4. Step 4: Simplify right side
    20,673.20x = 368,386,615.68
  5. Step 5: Solve for x
    x = 368,386,615.68/20,673.20
  6. Step 6: Final answer
    x = 17,819.53

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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.