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Finding the Fourth Proportional to 386.25, 579.24 and 142.65

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Solution

The fourth proportional to 386.25, 579.24 and 142.65 is: 213.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.25 : 579.24 = 142.65 : x
  2. Step 2: Convert to fraction form
    386.25/579.24 = 142.65/x
  3. Step 3: Cross multiply
    386.25x = 579.24 × 142.65
  4. Step 4: Simplify right side
    386.25x = 82,628.59
  5. Step 5: Solve for x
    x = 82,628.59/386.25
  6. Step 6: Final answer
    x = 213.93

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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.