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Finding the Fourth Proportional to 696.80, 1,039.91 and 668.54

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Solution

The fourth proportional to 696.80, 1,039.91 and 668.54 is: 997.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    696.80 : 1,039.91 = 668.54 : x
  2. Step 2: Convert to fraction form
    696.80/1,039.91 = 668.54/x
  3. Step 3: Cross multiply
    696.80x = 1,039.91 × 668.54
  4. Step 4: Simplify right side
    696.80x = 695,212.89
  5. Step 5: Solve for x
    x = 695,212.89/696.80
  6. Step 6: Final answer
    x = 997.73

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.