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Finding the Fourth Proportional to 261.64, 361.05 and 143.61

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Solution

The fourth proportional to 261.64, 361.05 and 143.61 is: 198.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.64 : 361.05 = 143.61 : x
  2. Step 2: Convert to fraction form
    261.64/361.05 = 143.61/x
  3. Step 3: Cross multiply
    261.64x = 361.05 × 143.61
  4. Step 4: Simplify right side
    261.64x = 51,849.66
  5. Step 5: Solve for x
    x = 51,849.66/261.64
  6. Step 6: Final answer
    x = 198.17

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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.