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Finding the Fourth Proportional to 361.19, 498.53 and 221.42

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Solution

The fourth proportional to 361.19, 498.53 and 221.42 is: 305.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    361.19 : 498.53 = 221.42 : x
  2. Step 2: Convert to fraction form
    361.19/498.53 = 221.42/x
  3. Step 3: Cross multiply
    361.19x = 498.53 × 221.42
  4. Step 4: Simplify right side
    361.19x = 110,386.31
  5. Step 5: Solve for x
    x = 110,386.31/361.19
  6. Step 6: Final answer
    x = 305.62

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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.