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Finding the Fourth Proportional to 1,083.75, 1,626.30 and 840.75

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Solution

The fourth proportional to 1,083.75, 1,626.30 and 840.75 is: 1,261.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,083.75 : 1,626.30 = 840.75 : x
  2. Step 2: Convert to fraction form
    1,083.75/1,626.30 = 840.75/x
  3. Step 3: Cross multiply
    1,083.75x = 1,626.30 × 840.75
  4. Step 4: Simplify right side
    1,083.75x = 1,367,311.73
  5. Step 5: Solve for x
    x = 1,367,311.73/1,083.75
  6. Step 6: Final answer
    x = 1,261.65

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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.