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Finding the Fourth Proportional to 1,211.56, 1,817.64 and 345.88

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Solution

The fourth proportional to 1,211.56, 1,817.64 and 345.88 is: 518.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.56 : 1,817.64 = 345.88 : x
  2. Step 2: Convert to fraction form
    1,211.56/1,817.64 = 345.88/x
  3. Step 3: Cross multiply
    1,211.56x = 1,817.64 × 345.88
  4. Step 4: Simplify right side
    1,211.56x = 628,685.32
  5. Step 5: Solve for x
    x = 628,685.32/1,211.56
  6. Step 6: Final answer
    x = 518.91

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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.