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Finding the Fourth Proportional to 3,999.78, 5,519.34 and 3,721.14

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Solution

The fourth proportional to 3,999.78, 5,519.34 and 3,721.14 is: 5,134.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,999.78 : 5,519.34 = 3,721.14 : x
  2. Step 2: Convert to fraction form
    3,999.78/5,519.34 = 3,721.14/x
  3. Step 3: Cross multiply
    3,999.78x = 5,519.34 × 3,721.14
  4. Step 4: Simplify right side
    3,999.78x = 20,538,236.85
  5. Step 5: Solve for x
    x = 20,538,236.85/3,999.78
  6. Step 6: Final answer
    x = 5,134.84

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.