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Finding the Fourth Proportional to 261.71, 361.17 and 151.20

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Solution

The fourth proportional to 261.71, 361.17 and 151.20 is: 208.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.71 : 361.17 = 151.20 : x
  2. Step 2: Convert to fraction form
    261.71/361.17 = 151.20/x
  3. Step 3: Cross multiply
    261.71x = 361.17 × 151.20
  4. Step 4: Simplify right side
    261.71x = 54,608.90
  5. Step 5: Solve for x
    x = 54,608.90/261.71
  6. Step 6: Final answer
    x = 208.66

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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.