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Finding the Fourth Proportional to 1,297.63, 1,790.73 and 831.88

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Solution

The fourth proportional to 1,297.63, 1,790.73 and 831.88 is: 1,147.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,297.63 : 1,790.73 = 831.88 : x
  2. Step 2: Convert to fraction form
    1,297.63/1,790.73 = 831.88/x
  3. Step 3: Cross multiply
    1,297.63x = 1,790.73 × 831.88
  4. Step 4: Simplify right side
    1,297.63x = 1,489,659.36
  5. Step 5: Solve for x
    x = 1,489,659.36/1,297.63
  6. Step 6: Final answer
    x = 1,147.99

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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.