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Finding the Fourth Proportional to 661.10, 991.41 and 336.41

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Solution

The fourth proportional to 661.10, 991.41 and 336.41 is: 504.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.10 : 991.41 = 336.41 : x
  2. Step 2: Convert to fraction form
    661.10/991.41 = 336.41/x
  3. Step 3: Cross multiply
    661.10x = 991.41 × 336.41
  4. Step 4: Simplify right side
    661.10x = 333,520.24
  5. Step 5: Solve for x
    x = 333,520.24/661.10
  6. Step 6: Final answer
    x = 504.49

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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.