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Finding the Fourth Proportional to 1,084.11, 1,626.21 and 902.78

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Solution

The fourth proportional to 1,084.11, 1,626.21 and 902.78 is: 1,354.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,084.11 : 1,626.21 = 902.78 : x
  2. Step 2: Convert to fraction form
    1,084.11/1,626.21 = 902.78/x
  3. Step 3: Cross multiply
    1,084.11x = 1,626.21 × 902.78
  4. Step 4: Simplify right side
    1,084.11x = 1,468,104.45
  5. Step 5: Solve for x
    x = 1,468,104.45/1,084.11
  6. Step 6: Final answer
    x = 1,354.21

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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.