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Finding the Fourth Proportional to 1,270.84, 1,906.30 and 405.80

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Solution

The fourth proportional to 1,270.84, 1,906.30 and 405.80 is: 608.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,270.84 : 1,906.30 = 405.80 : x
  2. Step 2: Convert to fraction form
    1,270.84/1,906.30 = 405.80/x
  3. Step 3: Cross multiply
    1,270.84x = 1,906.30 × 405.80
  4. Step 4: Simplify right side
    1,270.84x = 773,576.54
  5. Step 5: Solve for x
    x = 773,576.54/1,270.84
  6. Step 6: Final answer
    x = 608.71

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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.