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Finding the Fourth Proportional to 1,797.75, 2,696.85 and 643.50

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Solution

The fourth proportional to 1,797.75, 2,696.85 and 643.50 is: 965.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,797.75 : 2,696.85 = 643.50 : x
  2. Step 2: Convert to fraction form
    1,797.75/2,696.85 = 643.50/x
  3. Step 3: Cross multiply
    1,797.75x = 2,696.85 × 643.50
  4. Step 4: Simplify right side
    1,797.75x = 1,735,422.98
  5. Step 5: Solve for x
    x = 1,735,422.98/1,797.75
  6. Step 6: Final answer
    x = 965.33

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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.