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Finding the Fourth Proportional to 386.13, 579.24 and 142.72

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Solution

The fourth proportional to 386.13, 579.24 and 142.72 is: 214.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.13 : 579.24 = 142.72 : x
  2. Step 2: Convert to fraction form
    386.13/579.24 = 142.72/x
  3. Step 3: Cross multiply
    386.13x = 579.24 × 142.72
  4. Step 4: Simplify right side
    386.13x = 82,669.13
  5. Step 5: Solve for x
    x = 82,669.13/386.13
  6. Step 6: Final answer
    x = 214.10

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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.