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Finding the Fourth Proportional to 605.12, 835.80 and 489.56

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Solution

The fourth proportional to 605.12, 835.80 and 489.56 is: 676.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    605.12 : 835.80 = 489.56 : x
  2. Step 2: Convert to fraction form
    605.12/835.80 = 489.56/x
  3. Step 3: Cross multiply
    605.12x = 835.80 × 489.56
  4. Step 4: Simplify right side
    605.12x = 409,174.25
  5. Step 5: Solve for x
    x = 409,174.25/605.12
  6. Step 6: Final answer
    x = 676.19

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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.