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Finding the Fourth Proportional to 3,331.90, 4,991.70 and 1,945.90

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Solution

The fourth proportional to 3,331.90, 4,991.70 and 1,945.90 is: 2,915.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,331.90 : 4,991.70 = 1,945.90 : x
  2. Step 2: Convert to fraction form
    3,331.90/4,991.70 = 1,945.90/x
  3. Step 3: Cross multiply
    3,331.90x = 4,991.70 × 1,945.90
  4. Step 4: Simplify right side
    3,331.90x = 9,713,349.03
  5. Step 5: Solve for x
    x = 9,713,349.03/3,331.90
  6. Step 6: Final answer
    x = 2,915.26

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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.