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Finding the Fourth Proportional to 1,329.90, 1,994.94 and 636.87

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Solution

The fourth proportional to 1,329.90, 1,994.94 and 636.87 is: 955.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,329.90 : 1,994.94 = 636.87 : x
  2. Step 2: Convert to fraction form
    1,329.90/1,994.94 = 636.87/x
  3. Step 3: Cross multiply
    1,329.90x = 1,994.94 × 636.87
  4. Step 4: Simplify right side
    1,329.90x = 1,270,517.44
  5. Step 5: Solve for x
    x = 1,270,517.44/1,329.90
  6. Step 6: Final answer
    x = 955.35

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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.