Home / 3,405.75-5,107.56-1,326.78

Finding the Fourth Proportional to 3,405.75, 5,107.56 and 1,326.78

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Solution

The fourth proportional to 3,405.75, 5,107.56 and 1,326.78 is: 1,989.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,405.75 : 5,107.56 = 1,326.78 : x
  2. Step 2: Convert to fraction form
    3,405.75/5,107.56 = 1,326.78/x
  3. Step 3: Cross multiply
    3,405.75x = 5,107.56 × 1,326.78
  4. Step 4: Simplify right side
    3,405.75x = 6,776,603.48
  5. Step 5: Solve for x
    x = 6,776,603.48/3,405.75
  6. Step 6: Final answer
    x = 1,989.76

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1.5x scale

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.