Home / 1,211.21-1,817.10-389.56

Finding the Fourth Proportional to 1,211.21, 1,817.10 and 389.56

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Solution

The fourth proportional to 1,211.21, 1,817.10 and 389.56 is: 584.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.21 : 1,817.10 = 389.56 : x
  2. Step 2: Convert to fraction form
    1,211.21/1,817.10 = 389.56/x
  3. Step 3: Cross multiply
    1,211.21x = 1,817.10 × 389.56
  4. Step 4: Simplify right side
    1,211.21x = 707,860.39
  5. Step 5: Solve for x
    x = 707,860.39/1,211.21
  6. Step 6: Final answer
    x = 584.43

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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.