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Finding the Fourth Proportional to 1,276.52, 1,761.65 and 745.74

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Solution

The fourth proportional to 1,276.52, 1,761.65 and 745.74 is: 1,029.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,276.52 : 1,761.65 = 745.74 : x
  2. Step 2: Convert to fraction form
    1,276.52/1,761.65 = 745.74/x
  3. Step 3: Cross multiply
    1,276.52x = 1,761.65 × 745.74
  4. Step 4: Simplify right side
    1,276.52x = 1,313,729.14
  5. Step 5: Solve for x
    x = 1,313,729.14/1,276.52
  6. Step 6: Final answer
    x = 1,029.15

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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.