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Finding the Fourth Proportional to 1,297.92, 1,791.15 and 708.47

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Solution

The fourth proportional to 1,297.92, 1,791.15 and 708.47 is: 977.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,297.92 : 1,791.15 = 708.47 : x
  2. Step 2: Convert to fraction form
    1,297.92/1,791.15 = 708.47/x
  3. Step 3: Cross multiply
    1,297.92x = 1,791.15 × 708.47
  4. Step 4: Simplify right side
    1,297.92x = 1,268,967.08
  5. Step 5: Solve for x
    x = 1,268,967.08/1,297.92
  6. Step 6: Final answer
    x = 977.69

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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.