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Finding the Fourth Proportional to 823.72, 1,137.75 and 674.73

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Solution

The fourth proportional to 823.72, 1,137.75 and 674.73 is: 931.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    823.72 : 1,137.75 = 674.73 : x
  2. Step 2: Convert to fraction form
    823.72/1,137.75 = 674.73/x
  3. Step 3: Cross multiply
    823.72x = 1,137.75 × 674.73
  4. Step 4: Simplify right side
    823.72x = 767,671.53
  5. Step 5: Solve for x
    x = 767,671.53/823.72
  6. Step 6: Final answer
    x = 931.96

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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.