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Finding the Fourth Proportional to 983.81, 1,357.31 and 629.78

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Solution

The fourth proportional to 983.81, 1,357.31 and 629.78 is: 868.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.81 : 1,357.31 = 629.78 : x
  2. Step 2: Convert to fraction form
    983.81/1,357.31 = 629.78/x
  3. Step 3: Cross multiply
    983.81x = 1,357.31 × 629.78
  4. Step 4: Simplify right side
    983.81x = 854,806.94
  5. Step 5: Solve for x
    x = 854,806.94/983.81
  6. Step 6: Final answer
    x = 868.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.