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Finding the Fourth Proportional to 750.88, 1,121.39 and 629.20

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Solution

The fourth proportional to 750.88, 1,121.39 and 629.20 is: 939.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    750.88 : 1,121.39 = 629.20 : x
  2. Step 2: Convert to fraction form
    750.88/1,121.39 = 629.20/x
  3. Step 3: Cross multiply
    750.88x = 1,121.39 × 629.20
  4. Step 4: Simplify right side
    750.88x = 705,578.59
  5. Step 5: Solve for x
    x = 705,578.59/750.88
  6. Step 6: Final answer
    x = 939.67

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.