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Finding the Fourth Proportional to 19,321.99, 28,986.24 and 5,991.91

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Solution

The fourth proportional to 19,321.99, 28,986.24 and 5,991.91 is: 8,988.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,321.99 : 28,986.24 = 5,991.91 : x
  2. Step 2: Convert to fraction form
    19,321.99/28,986.24 = 5,991.91/x
  3. Step 3: Cross multiply
    19,321.99x = 28,986.24 × 5,991.91
  4. Step 4: Simplify right side
    19,321.99x = 173,682,941.32
  5. Step 5: Solve for x
    x = 173,682,941.32/19,321.99
  6. Step 6: Final answer
    x = 8,988.87

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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.