Home / 1,211.20-1,817.08-389.52

Finding the Fourth Proportional to 1,211.20, 1,817.08 and 389.52

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Solution

The fourth proportional to 1,211.20, 1,817.08 and 389.52 is: 584.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.20 : 1,817.08 = 389.52 : x
  2. Step 2: Convert to fraction form
    1,211.20/1,817.08 = 389.52/x
  3. Step 3: Cross multiply
    1,211.20x = 1,817.08 × 389.52
  4. Step 4: Simplify right side
    1,211.20x = 707,789.00
  5. Step 5: Solve for x
    x = 707,789.00/1,211.20
  6. Step 6: Final answer
    x = 584.37

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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.