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Finding the Fourth Proportional to 261.85, 361.34 and 143.82

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Solution

The fourth proportional to 261.85, 361.34 and 143.82 is: 198.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.85 : 361.34 = 143.82 : x
  2. Step 2: Convert to fraction form
    261.85/361.34 = 143.82/x
  3. Step 3: Cross multiply
    261.85x = 361.34 × 143.82
  4. Step 4: Simplify right side
    261.85x = 51,967.74
  5. Step 5: Solve for x
    x = 51,967.74/261.85
  6. Step 6: Final answer
    x = 198.47

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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.