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Finding the Fourth Proportional to 2,639.16, 3,960.11 and 1,914.71

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Solution

The fourth proportional to 2,639.16, 3,960.11 and 1,914.71 is: 2,873.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,639.16 : 3,960.11 = 1,914.71 : x
  2. Step 2: Convert to fraction form
    2,639.16/3,960.11 = 1,914.71/x
  3. Step 3: Cross multiply
    2,639.16x = 3,960.11 × 1,914.71
  4. Step 4: Simplify right side
    2,639.16x = 7,582,462.22
  5. Step 5: Solve for x
    x = 7,582,462.22/2,639.16
  6. Step 6: Final answer
    x = 2,873.06

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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.