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Finding the Fourth Proportional to 1,270.88, 1,902.81 and 1,085.73

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Solution

The fourth proportional to 1,270.88, 1,902.81 and 1,085.73 is: 1,625.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,270.88 : 1,902.81 = 1,085.73 : x
  2. Step 2: Convert to fraction form
    1,270.88/1,902.81 = 1,085.73/x
  3. Step 3: Cross multiply
    1,270.88x = 1,902.81 × 1,085.73
  4. Step 4: Simplify right side
    1,270.88x = 2,065,937.90
  5. Step 5: Solve for x
    x = 2,065,937.90/1,270.88
  6. Step 6: Final answer
    x = 1,625.60

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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.