Home / 1,311.64-1,966.98-445.80

Finding the Fourth Proportional to 1,311.64, 1,966.98 and 445.80

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Solution

The fourth proportional to 1,311.64, 1,966.98 and 445.80 is: 668.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.64 : 1,966.98 = 445.80 : x
  2. Step 2: Convert to fraction form
    1,311.64/1,966.98 = 445.80/x
  3. Step 3: Cross multiply
    1,311.64x = 1,966.98 × 445.80
  4. Step 4: Simplify right side
    1,311.64x = 876,879.68
  5. Step 5: Solve for x
    x = 876,879.68/1,311.64
  6. Step 6: Final answer
    x = 668.54

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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.