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Finding the Fourth Proportional to 1,090.21, 1,634.80 and 396.39

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Solution

The fourth proportional to 1,090.21, 1,634.80 and 396.39 is: 594.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,090.21 : 1,634.80 = 396.39 : x
  2. Step 2: Convert to fraction form
    1,090.21/1,634.80 = 396.39/x
  3. Step 3: Cross multiply
    1,090.21x = 1,634.80 × 396.39
  4. Step 4: Simplify right side
    1,090.21x = 648,018.37
  5. Step 5: Solve for x
    x = 648,018.37/1,090.21
  6. Step 6: Final answer
    x = 594.40

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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.