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Finding the Fourth Proportional to 1,090.11, 1,634.91 and 396.78

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Solution

The fourth proportional to 1,090.11, 1,634.91 and 396.78 is: 595.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,090.11 : 1,634.91 = 396.78 : x
  2. Step 2: Convert to fraction form
    1,090.11/1,634.91 = 396.78/x
  3. Step 3: Cross multiply
    1,090.11x = 1,634.91 × 396.78
  4. Step 4: Simplify right side
    1,090.11x = 648,699.59
  5. Step 5: Solve for x
    x = 648,699.59/1,090.11
  6. Step 6: Final answer
    x = 595.08

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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.