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Finding the Fourth Proportional to 609.98, 841.78 and 330.22

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Solution

The fourth proportional to 609.98, 841.78 and 330.22 is: 455.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    609.98 : 841.78 = 330.22 : x
  2. Step 2: Convert to fraction form
    609.98/841.78 = 330.22/x
  3. Step 3: Cross multiply
    609.98x = 841.78 × 330.22
  4. Step 4: Simplify right side
    609.98x = 277,975.24
  5. Step 5: Solve for x
    x = 277,975.24/609.98
  6. Step 6: Final answer
    x = 455.71

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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.