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Finding the Fourth Proportional to 20,406.20, 30,609.30 and 18,721.40

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Solution

The fourth proportional to 20,406.20, 30,609.30 and 18,721.40 is: 28,082.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,406.20 : 30,609.30 = 18,721.40 : x
  2. Step 2: Convert to fraction form
    20,406.20/30,609.30 = 18,721.40/x
  3. Step 3: Cross multiply
    20,406.20x = 30,609.30 × 18,721.40
  4. Step 4: Simplify right side
    20,406.20x = 573,048,949.02
  5. Step 5: Solve for x
    x = 573,048,949.02/20,406.20
  6. Step 6: Final answer
    x = 28,082.10

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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.