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Finding the Fourth Proportional to 20,195.60, 30,235.80 and 12,419.60

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Solution

The fourth proportional to 20,195.60, 30,235.80 and 12,419.60 is: 18,593.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,195.60 : 30,235.80 = 12,419.60 : x
  2. Step 2: Convert to fraction form
    20,195.60/30,235.80 = 12,419.60/x
  3. Step 3: Cross multiply
    20,195.60x = 30,235.80 × 12,419.60
  4. Step 4: Simplify right side
    20,195.60x = 375,516,541.68
  5. Step 5: Solve for x
    x = 375,516,541.68/20,195.60
  6. Step 6: Final answer
    x = 18,593.98

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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.