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Finding the Fourth Proportional to 816.21, 1,125.61 and 629.41

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Solution

The fourth proportional to 816.21, 1,125.61 and 629.41 is: 867.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.21 : 1,125.61 = 629.41 : x
  2. Step 2: Convert to fraction form
    816.21/1,125.61 = 629.41/x
  3. Step 3: Cross multiply
    816.21x = 1,125.61 × 629.41
  4. Step 4: Simplify right side
    816.21x = 708,465.80
  5. Step 5: Solve for x
    x = 708,465.80/816.21
  6. Step 6: Final answer
    x = 867.99

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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.