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Finding the Fourth Proportional to 7,678, 11,519.70 and 3,785.14

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Solution

The fourth proportional to 7,678, 11,519.70 and 3,785.14 is: 5,679.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,678 : 11,519.70 = 3,785.14 : x
  2. Step 2: Convert to fraction form
    7,678/11,519.70 = 3,785.14/x
  3. Step 3: Cross multiply
    7,678x = 11,519.70 × 3,785.14
  4. Step 4: Simplify right side
    7,678x = 43,603,677.26
  5. Step 5: Solve for x
    x = 43,603,677.26/7,678
  6. Step 6: Final answer
    x = 5,679.04

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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.