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Finding the Fourth Proportional to 1,278.78, 1,917.96 and 401.07

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Solution

The fourth proportional to 1,278.78, 1,917.96 and 401.07 is: 601.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.78 : 1,917.96 = 401.07 : x
  2. Step 2: Convert to fraction form
    1,278.78/1,917.96 = 401.07/x
  3. Step 3: Cross multiply
    1,278.78x = 1,917.96 × 401.07
  4. Step 4: Simplify right side
    1,278.78x = 769,236.22
  5. Step 5: Solve for x
    x = 769,236.22/1,278.78
  6. Step 6: Final answer
    x = 601.54

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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.