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Finding the Fourth Proportional to 386.36, 579.52 and 142.87

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Solution

The fourth proportional to 386.36, 579.52 and 142.87 is: 214.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.36 : 579.52 = 142.87 : x
  2. Step 2: Convert to fraction form
    386.36/579.52 = 142.87/x
  3. Step 3: Cross multiply
    386.36x = 579.52 × 142.87
  4. Step 4: Simplify right side
    386.36x = 82,796.02
  5. Step 5: Solve for x
    x = 82,796.02/386.36
  6. Step 6: Final answer
    x = 214.30

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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.