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Finding the Fourth Proportional to 320.86, 481.44 and 138.31

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Solution

The fourth proportional to 320.86, 481.44 and 138.31 is: 207.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.86 : 481.44 = 138.31 : x
  2. Step 2: Convert to fraction form
    320.86/481.44 = 138.31/x
  3. Step 3: Cross multiply
    320.86x = 481.44 × 138.31
  4. Step 4: Simplify right side
    320.86x = 66,587.28
  5. Step 5: Solve for x
    x = 66,587.28/320.86
  6. Step 6: Final answer
    x = 207.53

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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.