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Finding the Fourth Proportional to 386.54, 579.38 and 155.11

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Solution

The fourth proportional to 386.54, 579.38 and 155.11 is: 232.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.54 : 579.38 = 155.11 : x
  2. Step 2: Convert to fraction form
    386.54/579.38 = 155.11/x
  3. Step 3: Cross multiply
    386.54x = 579.38 × 155.11
  4. Step 4: Simplify right side
    386.54x = 89,867.63
  5. Step 5: Solve for x
    x = 89,867.63/386.54
  6. Step 6: Final answer
    x = 232.49

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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.