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Finding the Fourth Proportional to 3,431.78, 4,735.89 and 1,939.38

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Solution

The fourth proportional to 3,431.78, 4,735.89 and 1,939.38 is: 2,676.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,431.78 : 4,735.89 = 1,939.38 : x
  2. Step 2: Convert to fraction form
    3,431.78/4,735.89 = 1,939.38/x
  3. Step 3: Cross multiply
    3,431.78x = 4,735.89 × 1,939.38
  4. Step 4: Simplify right side
    3,431.78x = 9,184,690.35
  5. Step 5: Solve for x
    x = 9,184,690.35/3,431.78
  6. Step 6: Final answer
    x = 2,676.36

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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.