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Finding the Fourth Proportional to 1,211.58, 1,817.40 and 389.88

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Solution

The fourth proportional to 1,211.58, 1,817.40 and 389.88 is: 584.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.58 : 1,817.40 = 389.88 : x
  2. Step 2: Convert to fraction form
    1,211.58/1,817.40 = 389.88/x
  3. Step 3: Cross multiply
    1,211.58x = 1,817.40 × 389.88
  4. Step 4: Simplify right side
    1,211.58x = 708,567.91
  5. Step 5: Solve for x
    x = 708,567.91/1,211.58
  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.