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Finding the Fourth Proportional to 983.38, 1,357.94 and 634.67

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Solution

The fourth proportional to 983.38, 1,357.94 and 634.67 is: 876.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.38 : 1,357.94 = 634.67 : x
  2. Step 2: Convert to fraction form
    983.38/1,357.94 = 634.67/x
  3. Step 3: Cross multiply
    983.38x = 1,357.94 × 634.67
  4. Step 4: Simplify right side
    983.38x = 861,843.78
  5. Step 5: Solve for x
    x = 861,843.78/983.38
  6. Step 6: Final answer
    x = 876.41

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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.