Home / 1,278.59-1,917.88-401.15

Finding the Fourth Proportional to 1,278.59, 1,917.88 and 401.15

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Solution

The fourth proportional to 1,278.59, 1,917.88 and 401.15 is: 601.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.59 : 1,917.88 = 401.15 : x
  2. Step 2: Convert to fraction form
    1,278.59/1,917.88 = 401.15/x
  3. Step 3: Cross multiply
    1,278.59x = 1,917.88 × 401.15
  4. Step 4: Simplify right side
    1,278.59x = 769,361.35
  5. Step 5: Solve for x
    x = 769,361.35/1,278.59
  6. Step 6: Final answer
    x = 601.73

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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.