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Finding the Fourth Proportional to 788.75, 1,087.91 and 683.65

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Solution

The fourth proportional to 788.75, 1,087.91 and 683.65 is: 942.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.75 : 1,087.91 = 683.65 : x
  2. Step 2: Convert to fraction form
    788.75/1,087.91 = 683.65/x
  3. Step 3: Cross multiply
    788.75x = 1,087.91 × 683.65
  4. Step 4: Simplify right side
    788.75x = 743,743.53
  5. Step 5: Solve for x
    x = 743,743.53/788.75
  6. Step 6: Final answer
    x = 942.95

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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.