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Finding the Fourth Proportional to 386.46, 579.68 and 112.54

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Solution

The fourth proportional to 386.46, 579.68 and 112.54 is: 168.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.46 : 579.68 = 112.54 : x
  2. Step 2: Convert to fraction form
    386.46/579.68 = 112.54/x
  3. Step 3: Cross multiply
    386.46x = 579.68 × 112.54
  4. Step 4: Simplify right side
    386.46x = 65,237.19
  5. Step 5: Solve for x
    x = 65,237.19/386.46
  6. Step 6: Final answer
    x = 168.81

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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.