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Finding the Fourth Proportional to 1,198.99, 1,798.49 and 418.79

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Solution

The fourth proportional to 1,198.99, 1,798.49 and 418.79 is: 628.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,198.99 : 1,798.49 = 418.79 : x
  2. Step 2: Convert to fraction form
    1,198.99/1,798.49 = 418.79/x
  3. Step 3: Cross multiply
    1,198.99x = 1,798.49 × 418.79
  4. Step 4: Simplify right side
    1,198.99x = 753,184.46
  5. Step 5: Solve for x
    x = 753,184.46/1,198.99
  6. Step 6: Final answer
    x = 628.18

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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.