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Finding the Fourth Proportional to 2,750.92, 4,128.32 and 1,290.12

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Solution

The fourth proportional to 2,750.92, 4,128.32 and 1,290.12 is: 1,936.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,750.92 : 4,128.32 = 1,290.12 : x
  2. Step 2: Convert to fraction form
    2,750.92/4,128.32 = 1,290.12/x
  3. Step 3: Cross multiply
    2,750.92x = 4,128.32 × 1,290.12
  4. Step 4: Simplify right side
    2,750.92x = 5,326,028.20
  5. Step 5: Solve for x
    x = 5,326,028.20/2,750.92
  6. Step 6: Final answer
    x = 1,936.09

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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.