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Finding the Fourth Proportional to 20,194.60, 30,309.90 and 11,864.20

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Solution

The fourth proportional to 20,194.60, 30,309.90 and 11,864.20 is: 17,806.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,194.60 : 30,309.90 = 11,864.20 : x
  2. Step 2: Convert to fraction form
    20,194.60/30,309.90 = 11,864.20/x
  3. Step 3: Cross multiply
    20,194.60x = 30,309.90 × 11,864.20
  4. Step 4: Simplify right side
    20,194.60x = 359,602,715.58
  5. Step 5: Solve for x
    x = 359,602,715.58/20,194.60
  6. Step 6: Final answer
    x = 17,806.87

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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.