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Finding the Fourth Proportional to 1,271.78, 1,903.98 and 1,028.78

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Solution

The fourth proportional to 1,271.78, 1,903.98 and 1,028.78 is: 1,540.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,271.78 : 1,903.98 = 1,028.78 : x
  2. Step 2: Convert to fraction form
    1,271.78/1,903.98 = 1,028.78/x
  3. Step 3: Cross multiply
    1,271.78x = 1,903.98 × 1,028.78
  4. Step 4: Simplify right side
    1,271.78x = 1,958,776.54
  5. Step 5: Solve for x
    x = 1,958,776.54/1,271.78
  6. Step 6: Final answer
    x = 1,540.19

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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.