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Finding the Fourth Proportional to 1,211.61, 1,817.35 and 389.86

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Solution

The fourth proportional to 1,211.61, 1,817.35 and 389.86 is: 584.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.61 : 1,817.35 = 389.86 : x
  2. Step 2: Convert to fraction form
    1,211.61/1,817.35 = 389.86/x
  3. Step 3: Cross multiply
    1,211.61x = 1,817.35 × 389.86
  4. Step 4: Simplify right side
    1,211.61x = 708,518.97
  5. Step 5: Solve for x
    x = 708,518.97/1,211.61
  6. Step 6: Final answer
    x = 584.78

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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.