Home / 2,155.06-3,231.91-1,428.49

Finding the Fourth Proportional to 2,155.06, 3,231.91 and 1,428.49

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Solution

The fourth proportional to 2,155.06, 3,231.91 and 1,428.49 is: 2,142.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,155.06 : 3,231.91 = 1,428.49 : x
  2. Step 2: Convert to fraction form
    2,155.06/3,231.91 = 1,428.49/x
  3. Step 3: Cross multiply
    2,155.06x = 3,231.91 × 1,428.49
  4. Step 4: Simplify right side
    2,155.06x = 4,616,751.12
  5. Step 5: Solve for x
    x = 4,616,751.12/2,155.06
  6. Step 6: Final answer
    x = 2,142.28

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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.