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Finding the Fourth Proportional to 3,450.88, 5,172.21 and 1,987

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Solution

The fourth proportional to 3,450.88, 5,172.21 and 1,987 is: 2,978.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,450.88 : 5,172.21 = 1,987 : x
  2. Step 2: Convert to fraction form
    3,450.88/5,172.21 = 1,987/x
  3. Step 3: Cross multiply
    3,450.88x = 5,172.21 × 1,987
  4. Step 4: Simplify right side
    3,450.88x = 10,277,181.27
  5. Step 5: Solve for x
    x = 10,277,181.27/3,450.88
  6. Step 6: Final answer
    x = 2,978.13

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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.