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Finding the Fourth Proportional to 1,329.55, 1,994.25 and 636.55

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Solution

The fourth proportional to 1,329.55, 1,994.25 and 636.55 is: 954.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,329.55 : 1,994.25 = 636.55 : x
  2. Step 2: Convert to fraction form
    1,329.55/1,994.25 = 636.55/x
  3. Step 3: Cross multiply
    1,329.55x = 1,994.25 × 636.55
  4. Step 4: Simplify right side
    1,329.55x = 1,269,439.84
  5. Step 5: Solve for x
    x = 1,269,439.84/1,329.55
  6. Step 6: Final answer
    x = 954.79

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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.