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Finding the Fourth Proportional to 1,321.38, 1,823.91 and 855.54

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Solution

The fourth proportional to 1,321.38, 1,823.91 and 855.54 is: 1,180.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.38 : 1,823.91 = 855.54 : x
  2. Step 2: Convert to fraction form
    1,321.38/1,823.91 = 855.54/x
  3. Step 3: Cross multiply
    1,321.38x = 1,823.91 × 855.54
  4. Step 4: Simplify right side
    1,321.38x = 1,560,427.96
  5. Step 5: Solve for x
    x = 1,560,427.96/1,321.38
  6. Step 6: Final answer
    x = 1,180.91

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.