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Finding the Fourth Proportional to 2,486.78, 3,729.77 and 755

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Solution

The fourth proportional to 2,486.78, 3,729.77 and 755 is: 1,132.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,486.78 : 3,729.77 = 755 : x
  2. Step 2: Convert to fraction form
    2,486.78/3,729.77 = 755/x
  3. Step 3: Cross multiply
    2,486.78x = 3,729.77 × 755
  4. Step 4: Simplify right side
    2,486.78x = 2,815,972.58
  5. Step 5: Solve for x
    x = 2,815,972.58/2,486.78
  6. Step 6: Final answer
    x = 1,132.38

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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.