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Finding the Fourth Proportional to 1,329.03, 1,991.72 and 678.41

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Solution

The fourth proportional to 1,329.03, 1,991.72 and 678.41 is: 1,016.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,329.03 : 1,991.72 = 678.41 : x
  2. Step 2: Convert to fraction form
    1,329.03/1,991.72 = 678.41/x
  3. Step 3: Cross multiply
    1,329.03x = 1,991.72 × 678.41
  4. Step 4: Simplify right side
    1,329.03x = 1,351,189.41
  5. Step 5: Solve for x
    x = 1,351,189.41/1,329.03
  6. Step 6: Final answer
    x = 1,016.67

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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.