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Finding the Fourth Proportional to 680.43, 1,015.71 and 629.67

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Solution

The fourth proportional to 680.43, 1,015.71 and 629.67 is: 939.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.43 : 1,015.71 = 629.67 : x
  2. Step 2: Convert to fraction form
    680.43/1,015.71 = 629.67/x
  3. Step 3: Cross multiply
    680.43x = 1,015.71 × 629.67
  4. Step 4: Simplify right side
    680.43x = 639,562.12
  5. Step 5: Solve for x
    x = 639,562.12/680.43
  6. Step 6: Final answer
    x = 939.94

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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.