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Finding the Fourth Proportional to 1,276.71, 1,761.65 and 717.17

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Solution

The fourth proportional to 1,276.71, 1,761.65 and 717.17 is: 989.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,276.71 : 1,761.65 = 717.17 : x
  2. Step 2: Convert to fraction form
    1,276.71/1,761.65 = 717.17/x
  3. Step 3: Cross multiply
    1,276.71x = 1,761.65 × 717.17
  4. Step 4: Simplify right side
    1,276.71x = 1,263,390.14
  5. Step 5: Solve for x
    x = 1,263,390.14/1,276.71
  6. Step 6: Final answer
    x = 989.57

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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.