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Finding the Fourth Proportional to 261.86, 361.28 and 163.58

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Solution

The fourth proportional to 261.86, 361.28 and 163.58 is: 225.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.86 : 361.28 = 163.58 : x
  2. Step 2: Convert to fraction form
    261.86/361.28 = 163.58/x
  3. Step 3: Cross multiply
    261.86x = 361.28 × 163.58
  4. Step 4: Simplify right side
    261.86x = 59,097.36
  5. Step 5: Solve for x
    x = 59,097.36/261.86
  6. Step 6: Final answer
    x = 225.68

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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.