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Finding the Fourth Proportional to 3,072.70, 4,609.02 and 764.20

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Solution

The fourth proportional to 3,072.70, 4,609.02 and 764.20 is: 1,146.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,072.70 : 4,609.02 = 764.20 : x
  2. Step 2: Convert to fraction form
    3,072.70/4,609.02 = 764.20/x
  3. Step 3: Cross multiply
    3,072.70x = 4,609.02 × 764.20
  4. Step 4: Simplify right side
    3,072.70x = 3,522,190.04
  5. Step 5: Solve for x
    x = 3,522,190.04/3,072.70
  6. Step 6: Final answer
    x = 1,146.29

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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.