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Finding the Fourth Proportional to 4,139.70, 6,221.70 and 3,605.10

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Solution

The fourth proportional to 4,139.70, 6,221.70 and 3,605.10 is: 5,418.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,139.70 : 6,221.70 = 3,605.10 : x
  2. Step 2: Convert to fraction form
    4,139.70/6,221.70 = 3,605.10/x
  3. Step 3: Cross multiply
    4,139.70x = 6,221.70 × 3,605.10
  4. Step 4: Simplify right side
    4,139.70x = 22,429,850.67
  5. Step 5: Solve for x
    x = 22,429,850.67/4,139.70
  6. Step 6: Final answer
    x = 5,418.23

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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.