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Finding the Fourth Proportional to 3,486.70, 5,220.45 and 3,313.90

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Solution

The fourth proportional to 3,486.70, 5,220.45 and 3,313.90 is: 4,961.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,486.70 : 5,220.45 = 3,313.90 : x
  2. Step 2: Convert to fraction form
    3,486.70/5,220.45 = 3,313.90/x
  3. Step 3: Cross multiply
    3,486.70x = 5,220.45 × 3,313.90
  4. Step 4: Simplify right side
    3,486.70x = 17,300,049.26
  5. Step 5: Solve for x
    x = 17,300,049.26/3,486.70
  6. Step 6: Final answer
    x = 4,961.73

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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.