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Finding the Fourth Proportional to 1,208.98, 1,668.36 and 685.18

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Solution

The fourth proportional to 1,208.98, 1,668.36 and 685.18 is: 945.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,208.98 : 1,668.36 = 685.18 : x
  2. Step 2: Convert to fraction form
    1,208.98/1,668.36 = 685.18/x
  3. Step 3: Cross multiply
    1,208.98x = 1,668.36 × 685.18
  4. Step 4: Simplify right side
    1,208.98x = 1,143,126.90
  5. Step 5: Solve for x
    x = 1,143,126.90/1,208.98
  6. Step 6: Final answer
    x = 945.53

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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.