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Finding the Fourth Proportional to 1,265.78, 1,896.89 and 745.90

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Solution

The fourth proportional to 1,265.78, 1,896.89 and 745.90 is: 1,117.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,265.78 : 1,896.89 = 745.90 : x
  2. Step 2: Convert to fraction form
    1,265.78/1,896.89 = 745.90/x
  3. Step 3: Cross multiply
    1,265.78x = 1,896.89 × 745.90
  4. Step 4: Simplify right side
    1,265.78x = 1,414,881.78
  5. Step 5: Solve for x
    x = 1,414,881.78/1,265.78
  6. Step 6: Final answer
    x = 1,117.79

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.