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Finding the Fourth Proportional to 1,091.99, 1,638.00 and 608.12

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Solution

The fourth proportional to 1,091.99, 1,638.00 and 608.12 is: 912.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,091.99 : 1,638.00 = 608.12 : x
  2. Step 2: Convert to fraction form
    1,091.99/1,638.00 = 608.12/x
  3. Step 3: Cross multiply
    1,091.99x = 1,638.00 × 608.12
  4. Step 4: Simplify right side
    1,091.99x = 996,090.85
  5. Step 5: Solve for x
    x = 996,090.85/1,091.99
  6. Step 6: Final answer
    x = 912.18

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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.