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Finding the Fourth Proportional to 2,679.70, 4,020 and 830.38

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Solution

The fourth proportional to 2,679.70, 4,020 and 830.38 is: 1,245.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,679.70 : 4,020 = 830.38 : x
  2. Step 2: Convert to fraction form
    2,679.70/4,020 = 830.38/x
  3. Step 3: Cross multiply
    2,679.70x = 4,020 × 830.38
  4. Step 4: Simplify right side
    2,679.70x = 3,338,127.60
  5. Step 5: Solve for x
    x = 3,338,127.60/2,679.70
  6. Step 6: Final answer
    x = 1,245.71

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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.