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Finding the Fourth Proportional to 1,276.75, 1,761.92 and 717.20

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Solution

The fourth proportional to 1,276.75, 1,761.92 and 717.20 is: 989.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,276.75 : 1,761.92 = 717.20 : x
  2. Step 2: Convert to fraction form
    1,276.75/1,761.92 = 717.20/x
  3. Step 3: Cross multiply
    1,276.75x = 1,761.92 × 717.20
  4. Step 4: Simplify right side
    1,276.75x = 1,263,649.02
  5. Step 5: Solve for x
    x = 1,263,649.02/1,276.75
  6. Step 6: Final answer
    x = 989.74

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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.