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Finding the Fourth Proportional to 20,001.20, 30,001.80 and 12,638.30

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Solution

The fourth proportional to 20,001.20, 30,001.80 and 12,638.30 is: 18,957.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,001.20 : 30,001.80 = 12,638.30 : x
  2. Step 2: Convert to fraction form
    20,001.20/30,001.80 = 12,638.30/x
  3. Step 3: Cross multiply
    20,001.20x = 30,001.80 × 12,638.30
  4. Step 4: Simplify right side
    20,001.20x = 379,171,748.94
  5. Step 5: Solve for x
    x = 379,171,748.94/20,001.20
  6. Step 6: Final answer
    x = 18,957.45

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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.