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Finding the Fourth Proportional to 3,985.75, 5,978.63 and 1,249.75

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Solution

The fourth proportional to 3,985.75, 5,978.63 and 1,249.75 is: 1,874.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,985.75 : 5,978.63 = 1,249.75 : x
  2. Step 2: Convert to fraction form
    3,985.75/5,978.63 = 1,249.75/x
  3. Step 3: Cross multiply
    3,985.75x = 5,978.63 × 1,249.75
  4. Step 4: Simplify right side
    3,985.75x = 7,471,792.84
  5. Step 5: Solve for x
    x = 7,471,792.84/3,985.75
  6. Step 6: Final answer
    x = 1,874.63

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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.