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Finding the Fourth Proportional to 261.59, 361.40 and 222.66

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Solution

The fourth proportional to 261.59, 361.40 and 222.66 is: 307.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.59 : 361.40 = 222.66 : x
  2. Step 2: Convert to fraction form
    261.59/361.40 = 222.66/x
  3. Step 3: Cross multiply
    261.59x = 361.40 × 222.66
  4. Step 4: Simplify right side
    261.59x = 80,469.32
  5. Step 5: Solve for x
    x = 80,469.32/261.59
  6. Step 6: Final answer
    x = 307.62

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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.