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Finding the Fourth Proportional to 1,298.46, 1,791.81 and 708.99

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Solution

The fourth proportional to 1,298.46, 1,791.81 and 708.99 is: 978.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,298.46 : 1,791.81 = 708.99 : x
  2. Step 2: Convert to fraction form
    1,298.46/1,791.81 = 708.99/x
  3. Step 3: Cross multiply
    1,298.46x = 1,791.81 × 708.99
  4. Step 4: Simplify right side
    1,298.46x = 1,270,375.37
  5. Step 5: Solve for x
    x = 1,270,375.37/1,298.46
  6. Step 6: Final answer
    x = 978.37

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.