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Finding the Fourth Proportional to 1,321.53, 1,822.95 and 855.78

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Solution

The fourth proportional to 1,321.53, 1,822.95 and 855.78 is: 1,180.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.53 : 1,822.95 = 855.78 : x
  2. Step 2: Convert to fraction form
    1,321.53/1,822.95 = 855.78/x
  3. Step 3: Cross multiply
    1,321.53x = 1,822.95 × 855.78
  4. Step 4: Simplify right side
    1,321.53x = 1,560,044.15
  5. Step 5: Solve for x
    x = 1,560,044.15/1,321.53
  6. Step 6: Final answer
    x = 1,180.48

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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.