Home / 2,128.57-3,177.25-1,972.21

Finding the Fourth Proportional to 2,128.57, 3,177.25 and 1,972.21

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Solution

The fourth proportional to 2,128.57, 3,177.25 and 1,972.21 is: 2,943.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,128.57 : 3,177.25 = 1,972.21 : x
  2. Step 2: Convert to fraction form
    2,128.57/3,177.25 = 1,972.21/x
  3. Step 3: Cross multiply
    2,128.57x = 3,177.25 × 1,972.21
  4. Step 4: Simplify right side
    2,128.57x = 6,266,204.22
  5. Step 5: Solve for x
    x = 6,266,204.22/2,128.57
  6. Step 6: Final answer
    x = 2,943.86

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.