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Finding the Fourth Proportional to 1,276.88, 1,761.96 and 717.26

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Solution

The fourth proportional to 1,276.88, 1,761.96 and 717.26 is: 989.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,276.88 : 1,761.96 = 717.26 : x
  2. Step 2: Convert to fraction form
    1,276.88/1,761.96 = 717.26/x
  3. Step 3: Cross multiply
    1,276.88x = 1,761.96 × 717.26
  4. Step 4: Simplify right side
    1,276.88x = 1,263,783.43
  5. Step 5: Solve for x
    x = 1,263,783.43/1,276.88
  6. Step 6: Final answer
    x = 989.74

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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.