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Finding the Fourth Proportional to 1,298.43, 1,791.80 and 708.95

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Solution

The fourth proportional to 1,298.43, 1,791.80 and 708.95 is: 978.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,298.43 : 1,791.80 = 708.95 : x
  2. Step 2: Convert to fraction form
    1,298.43/1,791.80 = 708.95/x
  3. Step 3: Cross multiply
    1,298.43x = 1,791.80 × 708.95
  4. Step 4: Simplify right side
    1,298.43x = 1,270,296.61
  5. Step 5: Solve for x
    x = 1,270,296.61/1,298.43
  6. Step 6: Final answer
    x = 978.33

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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.