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Finding the Fourth Proportional to 823.05, 1,135.82 and 528.82

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Solution

The fourth proportional to 823.05, 1,135.82 and 528.82 is: 729.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    823.05 : 1,135.82 = 528.82 : x
  2. Step 2: Convert to fraction form
    823.05/1,135.82 = 528.82/x
  3. Step 3: Cross multiply
    823.05x = 1,135.82 × 528.82
  4. Step 4: Simplify right side
    823.05x = 600,644.33
  5. Step 5: Solve for x
    x = 600,644.33/823.05
  6. Step 6: Final answer
    x = 729.78

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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.