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Finding the Fourth Proportional to 1,211.88, 1,816.91 and 389.69

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Solution

The fourth proportional to 1,211.88, 1,816.91 and 389.69 is: 584.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.88 : 1,816.91 = 389.69 : x
  2. Step 2: Convert to fraction form
    1,211.88/1,816.91 = 389.69/x
  3. Step 3: Cross multiply
    1,211.88x = 1,816.91 × 389.69
  4. Step 4: Simplify right side
    1,211.88x = 708,022.57
  5. Step 5: Solve for x
    x = 708,022.57/1,211.88
  6. Step 6: Final answer
    x = 584.23

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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.