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Finding the Fourth Proportional to 261.78, 361.29 and 158.28

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Solution

The fourth proportional to 261.78, 361.29 and 158.28 is: 218.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.78 : 361.29 = 158.28 : x
  2. Step 2: Convert to fraction form
    261.78/361.29 = 158.28/x
  3. Step 3: Cross multiply
    261.78x = 361.29 × 158.28
  4. Step 4: Simplify right side
    261.78x = 57,184.98
  5. Step 5: Solve for x
    x = 57,184.98/261.78
  6. Step 6: Final answer
    x = 218.45

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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.