Home / 1,278.26-1,765.04-1,028.78

Finding the Fourth Proportional to 1,278.26, 1,765.04 and 1,028.78

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Solution

The fourth proportional to 1,278.26, 1,765.04 and 1,028.78 is: 1,420.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.26 : 1,765.04 = 1,028.78 : x
  2. Step 2: Convert to fraction form
    1,278.26/1,765.04 = 1,028.78/x
  3. Step 3: Cross multiply
    1,278.26x = 1,765.04 × 1,028.78
  4. Step 4: Simplify right side
    1,278.26x = 1,815,823.88
  5. Step 5: Solve for x
    x = 1,815,823.88/1,278.26
  6. Step 6: Final answer
    x = 1,420.55

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.