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Finding the Fourth Proportional to 5,279.66, 7,919.48 and 2,161.12

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Solution

The fourth proportional to 5,279.66, 7,919.48 and 2,161.12 is: 3,241.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,279.66 : 7,919.48 = 2,161.12 : x
  2. Step 2: Convert to fraction form
    5,279.66/7,919.48 = 2,161.12/x
  3. Step 3: Cross multiply
    5,279.66x = 7,919.48 × 2,161.12
  4. Step 4: Simplify right side
    5,279.66x = 17,114,946.62
  5. Step 5: Solve for x
    x = 17,114,946.62/5,279.66
  6. Step 6: Final answer
    x = 3,241.68

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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.