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Finding the Fourth Proportional to 386.18, 579.16 and 112.29

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Solution

The fourth proportional to 386.18, 579.16 and 112.29 is: 168.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.18 : 579.16 = 112.29 : x
  2. Step 2: Convert to fraction form
    386.18/579.16 = 112.29/x
  3. Step 3: Cross multiply
    386.18x = 579.16 × 112.29
  4. Step 4: Simplify right side
    386.18x = 65,033.88
  5. Step 5: Solve for x
    x = 65,033.88/386.18
  6. Step 6: Final answer
    x = 168.40

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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.