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Finding the Fourth Proportional to 1,100.67, 1,517.85 and 890.70

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Solution

The fourth proportional to 1,100.67, 1,517.85 and 890.70 is: 1,228.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,100.67 : 1,517.85 = 890.70 : x
  2. Step 2: Convert to fraction form
    1,100.67/1,517.85 = 890.70/x
  3. Step 3: Cross multiply
    1,100.67x = 1,517.85 × 890.70
  4. Step 4: Simplify right side
    1,100.67x = 1,351,949.00
  5. Step 5: Solve for x
    x = 1,351,949.00/1,100.67
  6. Step 6: Final answer
    x = 1,228.30

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.