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Finding the Fourth Proportional to 386.89, 580.34 and 143.37

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Solution

The fourth proportional to 386.89, 580.34 and 143.37 is: 215.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.89 : 580.34 = 143.37 : x
  2. Step 2: Convert to fraction form
    386.89/580.34 = 143.37/x
  3. Step 3: Cross multiply
    386.89x = 580.34 × 143.37
  4. Step 4: Simplify right side
    386.89x = 83,203.70
  5. Step 5: Solve for x
    x = 83,203.70/386.89
  6. Step 6: Final answer
    x = 215.06

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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.