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Finding the Fourth Proportional to 3,918.87, 5,408.37 and 2,347.47

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Solution

The fourth proportional to 3,918.87, 5,408.37 and 2,347.47 is: 3,239.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,918.87 : 5,408.37 = 2,347.47 : x
  2. Step 2: Convert to fraction form
    3,918.87/5,408.37 = 2,347.47/x
  3. Step 3: Cross multiply
    3,918.87x = 5,408.37 × 2,347.47
  4. Step 4: Simplify right side
    3,918.87x = 12,695,986.32
  5. Step 5: Solve for x
    x = 12,695,986.32/3,918.87
  6. Step 6: Final answer
    x = 3,239.71

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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.