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Finding the Fourth Proportional to 1,298.09, 1,791.36 and 708.63

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Solution

The fourth proportional to 1,298.09, 1,791.36 and 708.63 is: 977.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,298.09 : 1,791.36 = 708.63 : x
  2. Step 2: Convert to fraction form
    1,298.09/1,791.36 = 708.63/x
  3. Step 3: Cross multiply
    1,298.09x = 1,791.36 × 708.63
  4. Step 4: Simplify right side
    1,298.09x = 1,269,411.44
  5. Step 5: Solve for x
    x = 1,269,411.44/1,298.09
  6. Step 6: Final answer
    x = 977.91

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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.