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Finding the Fourth Proportional to 745.90, 1,029.36 and 490.29

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Solution

The fourth proportional to 745.90, 1,029.36 and 490.29 is: 676.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.90 : 1,029.36 = 490.29 : x
  2. Step 2: Convert to fraction form
    745.90/1,029.36 = 490.29/x
  3. Step 3: Cross multiply
    745.90x = 1,029.36 × 490.29
  4. Step 4: Simplify right side
    745.90x = 504,684.48
  5. Step 5: Solve for x
    x = 504,684.48/745.90
  6. Step 6: Final answer
    x = 676.61

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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.