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Finding the Fourth Proportional to 2,639.70, 3,960.09 and 1,179

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Solution

The fourth proportional to 2,639.70, 3,960.09 and 1,179 is: 1,768.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,639.70 : 3,960.09 = 1,179 : x
  2. Step 2: Convert to fraction form
    2,639.70/3,960.09 = 1,179/x
  3. Step 3: Cross multiply
    2,639.70x = 3,960.09 × 1,179
  4. Step 4: Simplify right side
    2,639.70x = 4,668,946.11
  5. Step 5: Solve for x
    x = 4,668,946.11/2,639.70
  6. Step 6: Final answer
    x = 1,768.74

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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.