Home / 1,311.21-1,965.60-489.24

Finding the Fourth Proportional to 1,311.21, 1,965.60 and 489.24

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Solution

The fourth proportional to 1,311.21, 1,965.60 and 489.24 is: 733.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.21 : 1,965.60 = 489.24 : x
  2. Step 2: Convert to fraction form
    1,311.21/1,965.60 = 489.24/x
  3. Step 3: Cross multiply
    1,311.21x = 1,965.60 × 489.24
  4. Step 4: Simplify right side
    1,311.21x = 961,650.14
  5. Step 5: Solve for x
    x = 961,650.14/1,311.21
  6. Step 6: Final answer
    x = 733.41

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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.