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Finding the Fourth Proportional to 829.61, 1,144.11 and 620.29

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Solution

The fourth proportional to 829.61, 1,144.11 and 620.29 is: 855.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    829.61 : 1,144.11 = 620.29 : x
  2. Step 2: Convert to fraction form
    829.61/1,144.11 = 620.29/x
  3. Step 3: Cross multiply
    829.61x = 1,144.11 × 620.29
  4. Step 4: Simplify right side
    829.61x = 709,679.99
  5. Step 5: Solve for x
    x = 709,679.99/829.61
  6. Step 6: Final answer
    x = 855.44

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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.