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Finding the Fourth Proportional to 1,209.25, 1,668.90 and 678.22

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Solution

The fourth proportional to 1,209.25, 1,668.90 and 678.22 is: 936.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209.25 : 1,668.90 = 678.22 : x
  2. Step 2: Convert to fraction form
    1,209.25/1,668.90 = 678.22/x
  3. Step 3: Cross multiply
    1,209.25x = 1,668.90 × 678.22
  4. Step 4: Simplify right side
    1,209.25x = 1,131,874.64
  5. Step 5: Solve for x
    x = 1,131,874.64/1,209.25
  6. Step 6: Final answer
    x = 936.02

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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.