Home / 1,378.23-2,067.35-512.55

Finding the Fourth Proportional to 1,378.23, 2,067.35 and 512.55

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Solution

The fourth proportional to 1,378.23, 2,067.35 and 512.55 is: 768.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,378.23 : 2,067.35 = 512.55 : x
  2. Step 2: Convert to fraction form
    1,378.23/2,067.35 = 512.55/x
  3. Step 3: Cross multiply
    1,378.23x = 2,067.35 × 512.55
  4. Step 4: Simplify right side
    1,378.23x = 1,059,617.68
  5. Step 5: Solve for x
    x = 1,059,617.68/1,378.23
  6. Step 6: Final answer
    x = 768.83

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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.