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Finding the Fourth Proportional to 1,276.21, 1,761.34 and 716.73

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Solution

The fourth proportional to 1,276.21, 1,761.34 and 716.73 is: 989.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,276.21 : 1,761.34 = 716.73 : x
  2. Step 2: Convert to fraction form
    1,276.21/1,761.34 = 716.73/x
  3. Step 3: Cross multiply
    1,276.21x = 1,761.34 × 716.73
  4. Step 4: Simplify right side
    1,276.21x = 1,262,403.43
  5. Step 5: Solve for x
    x = 1,262,403.43/1,276.21
  6. Step 6: Final answer
    x = 989.18

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1.5x scale

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.