Home / 3,128.40-4,301.64-2,998.80

Finding the Fourth Proportional to 3,128.40, 4,301.64 and 2,998.80

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Solution

The fourth proportional to 3,128.40, 4,301.64 and 2,998.80 is: 4,123.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,128.40 : 4,301.64 = 2,998.80 : x
  2. Step 2: Convert to fraction form
    3,128.40/4,301.64 = 2,998.80/x
  3. Step 3: Cross multiply
    3,128.40x = 4,301.64 × 2,998.80
  4. Step 4: Simplify right side
    3,128.40x = 12,899,758.03
  5. Step 5: Solve for x
    x = 12,899,758.03/3,128.40
  6. Step 6: Final answer
    x = 4,123.44

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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.