Home / 3,121.51-4,680.69-1,040.78

Finding the Fourth Proportional to 3,121.51, 4,680.69 and 1,040.78

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Solution

The fourth proportional to 3,121.51, 4,680.69 and 1,040.78 is: 1,560.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,121.51 : 4,680.69 = 1,040.78 : x
  2. Step 2: Convert to fraction form
    3,121.51/4,680.69 = 1,040.78/x
  3. Step 3: Cross multiply
    3,121.51x = 4,680.69 × 1,040.78
  4. Step 4: Simplify right side
    3,121.51x = 4,871,568.54
  5. Step 5: Solve for x
    x = 4,871,568.54/3,121.51
  6. Step 6: Final answer
    x = 1,560.64

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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.