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Finding the Fourth Proportional to 20,132.60, 30,198.90 and 12,259.40

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Solution

The fourth proportional to 20,132.60, 30,198.90 and 12,259.40 is: 18,389.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,132.60 : 30,198.90 = 12,259.40 : x
  2. Step 2: Convert to fraction form
    20,132.60/30,198.90 = 12,259.40/x
  3. Step 3: Cross multiply
    20,132.60x = 30,198.90 × 12,259.40
  4. Step 4: Simplify right side
    20,132.60x = 370,220,394.66
  5. Step 5: Solve for x
    x = 370,220,394.66/20,132.60
  6. Step 6: Final answer
    x = 18,389.10

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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.