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Finding the Fourth Proportional to 261.75, 361.20 and 151.24

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Solution

The fourth proportional to 261.75, 361.20 and 151.24 is: 208.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.75 : 361.20 = 151.24 : x
  2. Step 2: Convert to fraction form
    261.75/361.20 = 151.24/x
  3. Step 3: Cross multiply
    261.75x = 361.20 × 151.24
  4. Step 4: Simplify right side
    261.75x = 54,625.33
  5. Step 5: Solve for x
    x = 54,625.33/261.75
  6. Step 6: Final answer
    x = 208.70

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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.