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Finding the Fourth Proportional to 7,619.79, 11,434.79 and 2,689.45

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Solution

The fourth proportional to 7,619.79, 11,434.79 and 2,689.45 is: 4,035.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,619.79 : 11,434.79 = 2,689.45 : x
  2. Step 2: Convert to fraction form
    7,619.79/11,434.79 = 2,689.45/x
  3. Step 3: Cross multiply
    7,619.79x = 11,434.79 × 2,689.45
  4. Step 4: Simplify right side
    7,619.79x = 30,753,295.97
  5. Step 5: Solve for x
    x = 30,753,295.97/7,619.79
  6. Step 6: Final answer
    x = 4,035.98

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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.