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Finding the Fourth Proportional to 3,987.81, 5,986.83 and 2,679.98

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Solution

The fourth proportional to 3,987.81, 5,986.83 and 2,679.98 is: 4,023.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,987.81 : 5,986.83 = 2,679.98 : x
  2. Step 2: Convert to fraction form
    3,987.81/5,986.83 = 2,679.98/x
  3. Step 3: Cross multiply
    3,987.81x = 5,986.83 × 2,679.98
  4. Step 4: Simplify right side
    3,987.81x = 16,044,554.73
  5. Step 5: Solve for x
    x = 16,044,554.73/3,987.81
  6. Step 6: Final answer
    x = 4,023.40

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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.