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Finding the Fourth Proportional to 1,311, 1,965.99 and 489.25

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Solution

The fourth proportional to 1,311, 1,965.99 and 489.25 is: 733.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311 : 1,965.99 = 489.25 : x
  2. Step 2: Convert to fraction form
    1,311/1,965.99 = 489.25/x
  3. Step 3: Cross multiply
    1,311x = 1,965.99 × 489.25
  4. Step 4: Simplify right side
    1,311x = 961,860.61
  5. Step 5: Solve for x
    x = 961,860.61/1,311
  6. Step 6: Final answer
    x = 733.68

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.