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Finding the Fourth Proportional to 661.12, 991.83 and 336.41

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Solution

The fourth proportional to 661.12, 991.83 and 336.41 is: 504.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.12 : 991.83 = 336.41 : x
  2. Step 2: Convert to fraction form
    661.12/991.83 = 336.41/x
  3. Step 3: Cross multiply
    661.12x = 991.83 × 336.41
  4. Step 4: Simplify right side
    661.12x = 333,661.53
  5. Step 5: Solve for x
    x = 333,661.53/661.12
  6. Step 6: Final answer
    x = 504.69

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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.