Home / 1,211.05-1,816.46-389.91

Finding the Fourth Proportional to 1,211.05, 1,816.46 and 389.91

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Solution

The fourth proportional to 1,211.05, 1,816.46 and 389.91 is: 584.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.05 : 1,816.46 = 389.91 : x
  2. Step 2: Convert to fraction form
    1,211.05/1,816.46 = 389.91/x
  3. Step 3: Cross multiply
    1,211.05x = 1,816.46 × 389.91
  4. Step 4: Simplify right side
    1,211.05x = 708,262.24
  5. Step 5: Solve for x
    x = 708,262.24/1,211.05
  6. Step 6: Final answer
    x = 584.83

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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.