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Finding the Fourth Proportional to 1,208.86, 1,668.20 and 684.99

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Solution

The fourth proportional to 1,208.86, 1,668.20 and 684.99 is: 945.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,208.86 : 1,668.20 = 684.99 : x
  2. Step 2: Convert to fraction form
    1,208.86/1,668.20 = 684.99/x
  3. Step 3: Cross multiply
    1,208.86x = 1,668.20 × 684.99
  4. Step 4: Simplify right side
    1,208.86x = 1,142,696.89
  5. Step 5: Solve for x
    x = 1,142,696.89/1,208.86
  6. Step 6: Final answer
    x = 945.27

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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.