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Finding the Fourth Proportional to 361.06, 498.18 and 221.20

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Solution

The fourth proportional to 361.06, 498.18 and 221.20 is: 305.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    361.06 : 498.18 = 221.20 : x
  2. Step 2: Convert to fraction form
    361.06/498.18 = 221.20/x
  3. Step 3: Cross multiply
    361.06x = 498.18 × 221.20
  4. Step 4: Simplify right side
    361.06x = 110,197.00
  5. Step 5: Solve for x
    x = 110,197.00/361.06
  6. Step 6: Final answer
    x = 305.21

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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.