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Finding the Fourth Proportional to 261.48, 361.20 and 219.96

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Solution

The fourth proportional to 261.48, 361.20 and 219.96 is: 303.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.48 : 361.20 = 219.96 : x
  2. Step 2: Convert to fraction form
    261.48/361.20 = 219.96/x
  3. Step 3: Cross multiply
    261.48x = 361.20 × 219.96
  4. Step 4: Simplify right side
    261.48x = 79,449.55
  5. Step 5: Solve for x
    x = 79,449.55/261.48
  6. Step 6: Final answer
    x = 303.85

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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.