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Finding the Fourth Proportional to 1,236.78, 1,855.42 and 403.90

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Solution

The fourth proportional to 1,236.78, 1,855.42 and 403.90 is: 605.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,236.78 : 1,855.42 = 403.90 : x
  2. Step 2: Convert to fraction form
    1,236.78/1,855.42 = 403.90/x
  3. Step 3: Cross multiply
    1,236.78x = 1,855.42 × 403.90
  4. Step 4: Simplify right side
    1,236.78x = 749,398.49
  5. Step 5: Solve for x
    x = 749,398.49/1,236.78
  6. Step 6: Final answer
    x = 605.93

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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.