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Finding the Fourth Proportional to 609.88, 916.80 and 489.46

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Solution

The fourth proportional to 609.88, 916.80 and 489.46 is: 735.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    609.88 : 916.80 = 489.46 : x
  2. Step 2: Convert to fraction form
    609.88/916.80 = 489.46/x
  3. Step 3: Cross multiply
    609.88x = 916.80 × 489.46
  4. Step 4: Simplify right side
    609.88x = 448,736.93
  5. Step 5: Solve for x
    x = 448,736.93/609.88
  6. Step 6: Final answer
    x = 735.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.