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Finding the Fourth Proportional to 775.60, 1,161.78 and 629.80

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Solution

The fourth proportional to 775.60, 1,161.78 and 629.80 is: 943.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.60 : 1,161.78 = 629.80 : x
  2. Step 2: Convert to fraction form
    775.60/1,161.78 = 629.80/x
  3. Step 3: Cross multiply
    775.60x = 1,161.78 × 629.80
  4. Step 4: Simplify right side
    775.60x = 731,689.04
  5. Step 5: Solve for x
    x = 731,689.04/775.60
  6. Step 6: Final answer
    x = 943.38

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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.