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Finding the Fourth Proportional to 1,090.80, 1,635.64 and 321.20

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Solution

The fourth proportional to 1,090.80, 1,635.64 and 321.20 is: 481.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,090.80 : 1,635.64 = 321.20 : x
  2. Step 2: Convert to fraction form
    1,090.80/1,635.64 = 321.20/x
  3. Step 3: Cross multiply
    1,090.80x = 1,635.64 × 321.20
  4. Step 4: Simplify right side
    1,090.80x = 525,367.57
  5. Step 5: Solve for x
    x = 525,367.57/1,090.80
  6. Step 6: Final answer
    x = 481.64

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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.