Home / 1,311.21-1,966.59-445.53

Finding the Fourth Proportional to 1,311.21, 1,966.59 and 445.53

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Solution

The fourth proportional to 1,311.21, 1,966.59 and 445.53 is: 668.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.21 : 1,966.59 = 445.53 : x
  2. Step 2: Convert to fraction form
    1,311.21/1,966.59 = 445.53/x
  3. Step 3: Cross multiply
    1,311.21x = 1,966.59 × 445.53
  4. Step 4: Simplify right side
    1,311.21x = 876,174.84
  5. Step 5: Solve for x
    x = 876,174.84/1,311.21
  6. Step 6: Final answer
    x = 668.22

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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.