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Finding the Fourth Proportional to 261.90, 361.45 and 151.37

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Solution

The fourth proportional to 261.90, 361.45 and 151.37 is: 208.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.90 : 361.45 = 151.37 : x
  2. Step 2: Convert to fraction form
    261.90/361.45 = 151.37/x
  3. Step 3: Cross multiply
    261.90x = 361.45 × 151.37
  4. Step 4: Simplify right side
    261.90x = 54,712.69
  5. Step 5: Solve for x
    x = 54,712.69/261.90
  6. Step 6: Final answer
    x = 208.91

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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.