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Finding the Fourth Proportional to 1,863.90, 2,795.90 and 1,128.52

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Solution

The fourth proportional to 1,863.90, 2,795.90 and 1,128.52 is: 1,692.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,863.90 : 2,795.90 = 1,128.52 : x
  2. Step 2: Convert to fraction form
    1,863.90/2,795.90 = 1,128.52/x
  3. Step 3: Cross multiply
    1,863.90x = 2,795.90 × 1,128.52
  4. Step 4: Simplify right side
    1,863.90x = 3,155,229.07
  5. Step 5: Solve for x
    x = 3,155,229.07/1,863.90
  6. Step 6: Final answer
    x = 1,692.81

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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.