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Finding the Fourth Proportional to 361.31, 542.21 and 156.06

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Solution

The fourth proportional to 361.31, 542.21 and 156.06 is: 234.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    361.31 : 542.21 = 156.06 : x
  2. Step 2: Convert to fraction form
    361.31/542.21 = 156.06/x
  3. Step 3: Cross multiply
    361.31x = 542.21 × 156.06
  4. Step 4: Simplify right side
    361.31x = 84,616.51
  5. Step 5: Solve for x
    x = 84,616.51/361.31
  6. Step 6: Final answer
    x = 234.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.