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Finding the Fourth Proportional to 2,605.26, 3,900.90 and 1,986.02

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Solution

The fourth proportional to 2,605.26, 3,900.90 and 1,986.02 is: 2,973.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,605.26 : 3,900.90 = 1,986.02 : x
  2. Step 2: Convert to fraction form
    2,605.26/3,900.90 = 1,986.02/x
  3. Step 3: Cross multiply
    2,605.26x = 3,900.90 × 1,986.02
  4. Step 4: Simplify right side
    2,605.26x = 7,747,265.42
  5. Step 5: Solve for x
    x = 7,747,265.42/2,605.26
  6. Step 6: Final answer
    x = 2,973.70

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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.