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Finding the Fourth Proportional to 12,138.60, 18,207.90 and 4,348.20

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Solution

The fourth proportional to 12,138.60, 18,207.90 and 4,348.20 is: 6,522.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,138.60 : 18,207.90 = 4,348.20 : x
  2. Step 2: Convert to fraction form
    12,138.60/18,207.90 = 4,348.20/x
  3. Step 3: Cross multiply
    12,138.60x = 18,207.90 × 4,348.20
  4. Step 4: Simplify right side
    12,138.60x = 79,171,590.78
  5. Step 5: Solve for x
    x = 79,171,590.78/12,138.60
  6. Step 6: Final answer
    x = 6,522.30

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Double scale
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Similar ratio
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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.