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Finding the Fourth Proportional to 386.43, 579.70 and 112.49

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Solution

The fourth proportional to 386.43, 579.70 and 112.49 is: 168.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.43 : 579.70 = 112.49 : x
  2. Step 2: Convert to fraction form
    386.43/579.70 = 112.49/x
  3. Step 3: Cross multiply
    386.43x = 579.70 × 112.49
  4. Step 4: Simplify right side
    386.43x = 65,208.70
  5. Step 5: Solve for x
    x = 65,208.70/386.43
  6. Step 6: Final answer
    x = 168.75

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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.