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Finding the Fourth Proportional to 20,348.60, 30,540.90 and 12,018.20

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Solution

The fourth proportional to 20,348.60, 30,540.90 and 12,018.20 is: 18,037.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,348.60 : 30,540.90 = 12,018.20 : x
  2. Step 2: Convert to fraction form
    20,348.60/30,540.90 = 12,018.20/x
  3. Step 3: Cross multiply
    20,348.60x = 30,540.90 × 12,018.20
  4. Step 4: Simplify right side
    20,348.60x = 367,046,644.38
  5. Step 5: Solve for x
    x = 367,046,644.38/20,348.60
  6. Step 6: Final answer
    x = 18,037.93

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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.