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Finding the Fourth Proportional to 386.38, 579.66 and 112.48

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Solution

The fourth proportional to 386.38, 579.66 and 112.48 is: 168.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.38 : 579.66 = 112.48 : x
  2. Step 2: Convert to fraction form
    386.38/579.66 = 112.48/x
  3. Step 3: Cross multiply
    386.38x = 579.66 × 112.48
  4. Step 4: Simplify right side
    386.38x = 65,199.59
  5. Step 5: Solve for x
    x = 65,199.59/386.38
  6. Step 6: Final answer
    x = 168.74

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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.