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Finding the Fourth Proportional to 1,276.38, 1,761.26 and 745.12

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Solution

The fourth proportional to 1,276.38, 1,761.26 and 745.12 is: 1,028.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,276.38 : 1,761.26 = 745.12 : x
  2. Step 2: Convert to fraction form
    1,276.38/1,761.26 = 745.12/x
  3. Step 3: Cross multiply
    1,276.38x = 1,761.26 × 745.12
  4. Step 4: Simplify right side
    1,276.38x = 1,312,350.05
  5. Step 5: Solve for x
    x = 1,312,350.05/1,276.38
  6. Step 6: Final answer
    x = 1,028.18

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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.