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Finding the Fourth Proportional to 860.80, 1,185.04 and 673.96

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Solution

The fourth proportional to 860.80, 1,185.04 and 673.96 is: 927.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.80 : 1,185.04 = 673.96 : x
  2. Step 2: Convert to fraction form
    860.80/1,185.04 = 673.96/x
  3. Step 3: Cross multiply
    860.80x = 1,185.04 × 673.96
  4. Step 4: Simplify right side
    860.80x = 798,669.56
  5. Step 5: Solve for x
    x = 798,669.56/860.80
  6. Step 6: Final answer
    x = 927.82

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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.