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Finding the Fourth Proportional to 609.88, 915.09 and 321.25

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Solution

The fourth proportional to 609.88, 915.09 and 321.25 is: 482.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    609.88 : 915.09 = 321.25 : x
  2. Step 2: Convert to fraction form
    609.88/915.09 = 321.25/x
  3. Step 3: Cross multiply
    609.88x = 915.09 × 321.25
  4. Step 4: Simplify right side
    609.88x = 293,972.66
  5. Step 5: Solve for x
    x = 293,972.66/609.88
  6. Step 6: Final answer
    x = 482.02

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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.