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Finding the Fourth Proportional to 1,091.85, 1,638.04 and 361.39

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Solution

The fourth proportional to 1,091.85, 1,638.04 and 361.39 is: 542.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,091.85 : 1,638.04 = 361.39 : x
  2. Step 2: Convert to fraction form
    1,091.85/1,638.04 = 361.39/x
  3. Step 3: Cross multiply
    1,091.85x = 1,638.04 × 361.39
  4. Step 4: Simplify right side
    1,091.85x = 591,971.28
  5. Step 5: Solve for x
    x = 591,971.28/1,091.85
  6. Step 6: Final answer
    x = 542.17

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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.