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Finding the Fourth Proportional to 2,643.66, 3,968.73 and 1,239.44

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Solution

The fourth proportional to 2,643.66, 3,968.73 and 1,239.44 is: 1,860.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,643.66 : 3,968.73 = 1,239.44 : x
  2. Step 2: Convert to fraction form
    2,643.66/3,968.73 = 1,239.44/x
  3. Step 3: Cross multiply
    2,643.66x = 3,968.73 × 1,239.44
  4. Step 4: Simplify right side
    2,643.66x = 4,918,982.87
  5. Step 5: Solve for x
    x = 4,918,982.87/2,643.66
  6. Step 6: Final answer
    x = 1,860.67

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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.