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Finding the Fourth Proportional to 386.50, 579.69 and 155.33

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Solution

The fourth proportional to 386.50, 579.69 and 155.33 is: 232.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.50 : 579.69 = 155.33 : x
  2. Step 2: Convert to fraction form
    386.50/579.69 = 155.33/x
  3. Step 3: Cross multiply
    386.50x = 579.69 × 155.33
  4. Step 4: Simplify right side
    386.50x = 90,043.25
  5. Step 5: Solve for x
    x = 90,043.25/386.50
  6. Step 6: Final answer
    x = 232.97

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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.