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Finding the Fourth Proportional to 2,636.88, 3,940.03 and 1,999.50

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Solution

The fourth proportional to 2,636.88, 3,940.03 and 1,999.50 is: 2,987.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,636.88 : 3,940.03 = 1,999.50 : x
  2. Step 2: Convert to fraction form
    2,636.88/3,940.03 = 1,999.50/x
  3. Step 3: Cross multiply
    2,636.88x = 3,940.03 × 1,999.50
  4. Step 4: Simplify right side
    2,636.88x = 7,878,089.99
  5. Step 5: Solve for x
    x = 7,878,089.99/2,636.88
  6. Step 6: Final answer
    x = 2,987.66

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.