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Finding the Fourth Proportional to 758.45, 1,139.92 and 629.29

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Solution

The fourth proportional to 758.45, 1,139.92 and 629.29 is: 945.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    758.45 : 1,139.92 = 629.29 : x
  2. Step 2: Convert to fraction form
    758.45/1,139.92 = 629.29/x
  3. Step 3: Cross multiply
    758.45x = 1,139.92 × 629.29
  4. Step 4: Simplify right side
    758.45x = 717,340.26
  5. Step 5: Solve for x
    x = 717,340.26/758.45
  6. Step 6: Final answer
    x = 945.80

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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.