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Finding the Fourth Proportional to 655.99, 905.85 and 489.92

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Solution

The fourth proportional to 655.99, 905.85 and 489.92 is: 676.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    655.99 : 905.85 = 489.92 : x
  2. Step 2: Convert to fraction form
    655.99/905.85 = 489.92/x
  3. Step 3: Cross multiply
    655.99x = 905.85 × 489.92
  4. Step 4: Simplify right side
    655.99x = 443,787.05
  5. Step 5: Solve for x
    x = 443,787.05/655.99
  6. Step 6: Final answer
    x = 676.52

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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.