Home / 3,121.78-4,681.83-1,247.59

Finding the Fourth Proportional to 3,121.78, 4,681.83 and 1,247.59

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Solution

The fourth proportional to 3,121.78, 4,681.83 and 1,247.59 is: 1,871.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,121.78 : 4,681.83 = 1,247.59 : x
  2. Step 2: Convert to fraction form
    3,121.78/4,681.83 = 1,247.59/x
  3. Step 3: Cross multiply
    3,121.78x = 4,681.83 × 1,247.59
  4. Step 4: Simplify right side
    3,121.78x = 5,840,980.88
  5. Step 5: Solve for x
    x = 5,840,980.88/3,121.78
  6. Step 6: Final answer
    x = 1,871.04

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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.