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Finding the Fourth Proportional to 261.74, 361.21 and 145.31

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Solution

The fourth proportional to 261.74, 361.21 and 145.31 is: 200.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.74 : 361.21 = 145.31 : x
  2. Step 2: Convert to fraction form
    261.74/361.21 = 145.31/x
  3. Step 3: Cross multiply
    261.74x = 361.21 × 145.31
  4. Step 4: Simplify right side
    261.74x = 52,485.62
  5. Step 5: Solve for x
    x = 52,485.62/261.74
  6. Step 6: Final answer
    x = 200.53

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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.