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Finding the Fourth Proportional to 1,270.50, 1,906.30 and 684.82

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Solution

The fourth proportional to 1,270.50, 1,906.30 and 684.82 is: 1,027.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,270.50 : 1,906.30 = 684.82 : x
  2. Step 2: Convert to fraction form
    1,270.50/1,906.30 = 684.82/x
  3. Step 3: Cross multiply
    1,270.50x = 1,906.30 × 684.82
  4. Step 4: Simplify right side
    1,270.50x = 1,305,475.60
  5. Step 5: Solve for x
    x = 1,305,475.60/1,270.50
  6. Step 6: Final answer
    x = 1,027.53

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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.