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Finding the Fourth Proportional to 3,987.45, 5,978.19 and 2,751.33

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Solution

The fourth proportional to 3,987.45, 5,978.19 and 2,751.33 is: 4,124.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,987.45 : 5,978.19 = 2,751.33 : x
  2. Step 2: Convert to fraction form
    3,987.45/5,978.19 = 2,751.33/x
  3. Step 3: Cross multiply
    3,987.45x = 5,978.19 × 2,751.33
  4. Step 4: Simplify right side
    3,987.45x = 16,447,973.49
  5. Step 5: Solve for x
    x = 16,447,973.49/3,987.45
  6. Step 6: Final answer
    x = 4,124.94

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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.