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Finding the Fourth Proportional to 361.51, 498.67 and 221.69

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Solution

The fourth proportional to 361.51, 498.67 and 221.69 is: 305.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    361.51 : 498.67 = 221.69 : x
  2. Step 2: Convert to fraction form
    361.51/498.67 = 221.69/x
  3. Step 3: Cross multiply
    361.51x = 498.67 × 221.69
  4. Step 4: Simplify right side
    361.51x = 110,550.15
  5. Step 5: Solve for x
    x = 110,550.15/361.51
  6. Step 6: Final answer
    x = 305.80

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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.