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Finding the Fourth Proportional to 1,209.21, 1,668.77 and 678.26

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Solution

The fourth proportional to 1,209.21, 1,668.77 and 678.26 is: 936.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209.21 : 1,668.77 = 678.26 : x
  2. Step 2: Convert to fraction form
    1,209.21/1,668.77 = 678.26/x
  3. Step 3: Cross multiply
    1,209.21x = 1,668.77 × 678.26
  4. Step 4: Simplify right side
    1,209.21x = 1,131,858.57
  5. Step 5: Solve for x
    x = 1,131,858.57/1,209.21
  6. Step 6: Final answer
    x = 936.03

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.