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Finding the Fourth Proportional to 1,321.36, 1,822.80 and 855.52

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Solution

The fourth proportional to 1,321.36, 1,822.80 and 855.52 is: 1,180.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.36 : 1,822.80 = 855.52 : x
  2. Step 2: Convert to fraction form
    1,321.36/1,822.80 = 855.52/x
  3. Step 3: Cross multiply
    1,321.36x = 1,822.80 × 855.52
  4. Step 4: Simplify right side
    1,321.36x = 1,559,441.86
  5. Step 5: Solve for x
    x = 1,559,441.86/1,321.36
  6. Step 6: Final answer
    x = 1,180.18

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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.