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Finding the Fourth Proportional to 361.78, 542.68 and 145.51

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Solution

The fourth proportional to 361.78, 542.68 and 145.51 is: 218.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    361.78 : 542.68 = 145.51 : x
  2. Step 2: Convert to fraction form
    361.78/542.68 = 145.51/x
  3. Step 3: Cross multiply
    361.78x = 542.68 × 145.51
  4. Step 4: Simplify right side
    361.78x = 78,963.65
  5. Step 5: Solve for x
    x = 78,963.65/361.78
  6. Step 6: Final answer
    x = 218.27

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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.