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Finding the Fourth Proportional to 1,208.72, 1,668 and 684.72

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Solution

The fourth proportional to 1,208.72, 1,668 and 684.72 is: 944.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,208.72 : 1,668 = 684.72 : x
  2. Step 2: Convert to fraction form
    1,208.72/1,668 = 684.72/x
  3. Step 3: Cross multiply
    1,208.72x = 1,668 × 684.72
  4. Step 4: Simplify right side
    1,208.72x = 1,142,112.96
  5. Step 5: Solve for x
    x = 1,142,112.96/1,208.72
  6. Step 6: Final answer
    x = 944.89

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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.