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Finding the Fourth Proportional to 1,209.33, 1,668.78 and 678.24

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Solution

The fourth proportional to 1,209.33, 1,668.78 and 678.24 is: 935.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209.33 : 1,668.78 = 678.24 : x
  2. Step 2: Convert to fraction form
    1,209.33/1,668.78 = 678.24/x
  3. Step 3: Cross multiply
    1,209.33x = 1,668.78 × 678.24
  4. Step 4: Simplify right side
    1,209.33x = 1,131,833.35
  5. Step 5: Solve for x
    x = 1,131,833.35/1,209.33
  6. Step 6: Final answer
    x = 935.92

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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.