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Finding the Fourth Proportional to 718.94, 1,078.49 and 198.95

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Solution

The fourth proportional to 718.94, 1,078.49 and 198.95 is: 298.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.94 : 1,078.49 = 198.95 : x
  2. Step 2: Convert to fraction form
    718.94/1,078.49 = 198.95/x
  3. Step 3: Cross multiply
    718.94x = 1,078.49 × 198.95
  4. Step 4: Simplify right side
    718.94x = 214,560.69
  5. Step 5: Solve for x
    x = 214,560.69/718.94
  6. Step 6: Final answer
    x = 298.44

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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.