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Finding the Fourth Proportional to 386.15, 579.09 and 112.17

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Solution

The fourth proportional to 386.15, 579.09 and 112.17 is: 168.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.15 : 579.09 = 112.17 : x
  2. Step 2: Convert to fraction form
    386.15/579.09 = 112.17/x
  3. Step 3: Cross multiply
    386.15x = 579.09 × 112.17
  4. Step 4: Simplify right side
    386.15x = 64,953.63
  5. Step 5: Solve for x
    x = 64,953.63/386.15
  6. Step 6: Final answer
    x = 168.21

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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.