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Finding the Fourth Proportional to 20,209.68, 30,304.53 and 12,212.69

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Solution

The fourth proportional to 20,209.68, 30,304.53 and 12,212.69 is: 18,312.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,209.68 : 30,304.53 = 12,212.69 : x
  2. Step 2: Convert to fraction form
    20,209.68/30,304.53 = 12,212.69/x
  3. Step 3: Cross multiply
    20,209.68x = 30,304.53 × 12,212.69
  4. Step 4: Simplify right side
    20,209.68x = 370,099,678.96
  5. Step 5: Solve for x
    x = 370,099,678.96/20,209.68
  6. Step 6: Final answer
    x = 18,312.99

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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.