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Finding the Fourth Proportional to 1,298.26, 1,791.58 and 708.78

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Solution

The fourth proportional to 1,298.26, 1,791.58 and 708.78 is: 978.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,298.26 : 1,791.58 = 708.78 : x
  2. Step 2: Convert to fraction form
    1,298.26/1,791.58 = 708.78/x
  3. Step 3: Cross multiply
    1,298.26x = 1,791.58 × 708.78
  4. Step 4: Simplify right side
    1,298.26x = 1,269,836.07
  5. Step 5: Solve for x
    x = 1,269,836.07/1,298.26
  6. Step 6: Final answer
    x = 978.11

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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.