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Finding the Fourth Proportional to 20,138.60, 30,207.90 and 5,349.80

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Solution

The fourth proportional to 20,138.60, 30,207.90 and 5,349.80 is: 8,024.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,138.60 : 30,207.90 = 5,349.80 : x
  2. Step 2: Convert to fraction form
    20,138.60/30,207.90 = 5,349.80/x
  3. Step 3: Cross multiply
    20,138.60x = 30,207.90 × 5,349.80
  4. Step 4: Simplify right side
    20,138.60x = 161,606,223.42
  5. Step 5: Solve for x
    x = 161,606,223.42/20,138.60
  6. Step 6: Final answer
    x = 8,024.70

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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.