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Finding the Fourth Proportional to 1,211.13, 1,816.92 and 389.41

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Solution

The fourth proportional to 1,211.13, 1,816.92 and 389.41 is: 584.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.13 : 1,816.92 = 389.41 : x
  2. Step 2: Convert to fraction form
    1,211.13/1,816.92 = 389.41/x
  3. Step 3: Cross multiply
    1,211.13x = 1,816.92 × 389.41
  4. Step 4: Simplify right side
    1,211.13x = 707,515.79
  5. Step 5: Solve for x
    x = 707,515.79/1,211.13
  6. Step 6: Final answer
    x = 584.18

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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.