Home / 1,278.09-1,917.45-412.41

Finding the Fourth Proportional to 1,278.09, 1,917.45 and 412.41

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Solution

The fourth proportional to 1,278.09, 1,917.45 and 412.41 is: 618.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.09 : 1,917.45 = 412.41 : x
  2. Step 2: Convert to fraction form
    1,278.09/1,917.45 = 412.41/x
  3. Step 3: Cross multiply
    1,278.09x = 1,917.45 × 412.41
  4. Step 4: Simplify right side
    1,278.09x = 790,766.82
  5. Step 5: Solve for x
    x = 790,766.82/1,278.09
  6. Step 6: Final answer
    x = 618.71

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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.