Home / 1,311.21-1,966.86-445.50

Finding the Fourth Proportional to 1,311.21, 1,966.86 and 445.50

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Solution

The fourth proportional to 1,311.21, 1,966.86 and 445.50 is: 668.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.21 : 1,966.86 = 445.50 : x
  2. Step 2: Convert to fraction form
    1,311.21/1,966.86 = 445.50/x
  3. Step 3: Cross multiply
    1,311.21x = 1,966.86 × 445.50
  4. Step 4: Simplify right side
    1,311.21x = 876,236.13
  5. Step 5: Solve for x
    x = 876,236.13/1,311.21
  6. Step 6: Final answer
    x = 668.27

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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.