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Finding the Fourth Proportional to 1,211.57, 1,817.16 and 345.68

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Solution

The fourth proportional to 1,211.57, 1,817.16 and 345.68 is: 518.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.57 : 1,817.16 = 345.68 : x
  2. Step 2: Convert to fraction form
    1,211.57/1,817.16 = 345.68/x
  3. Step 3: Cross multiply
    1,211.57x = 1,817.16 × 345.68
  4. Step 4: Simplify right side
    1,211.57x = 628,155.87
  5. Step 5: Solve for x
    x = 628,155.87/1,211.57
  6. Step 6: Final answer
    x = 518.46

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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.