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Finding the Fourth Proportional to 1,211.43, 1,817.14 and 345.74

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Solution

The fourth proportional to 1,211.43, 1,817.14 and 345.74 is: 518.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.43 : 1,817.14 = 345.74 : x
  2. Step 2: Convert to fraction form
    1,211.43/1,817.14 = 345.74/x
  3. Step 3: Cross multiply
    1,211.43x = 1,817.14 × 345.74
  4. Step 4: Simplify right side
    1,211.43x = 628,257.98
  5. Step 5: Solve for x
    x = 628,257.98/1,211.43
  6. Step 6: Final answer
    x = 518.61

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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.