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Finding the Fourth Proportional to 775.10, 1,161.02 and 629.30

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Solution

The fourth proportional to 775.10, 1,161.02 and 629.30 is: 942.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.10 : 1,161.02 = 629.30 : x
  2. Step 2: Convert to fraction form
    775.10/1,161.02 = 629.30/x
  3. Step 3: Cross multiply
    775.10x = 1,161.02 × 629.30
  4. Step 4: Simplify right side
    775.10x = 730,629.89
  5. Step 5: Solve for x
    x = 730,629.89/775.10
  6. Step 6: Final answer
    x = 942.63

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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.