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Finding the Fourth Proportional to 320.92, 481.38 and 77.45

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Solution

The fourth proportional to 320.92, 481.38 and 77.45 is: 116.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.92 : 481.38 = 77.45 : x
  2. Step 2: Convert to fraction form
    320.92/481.38 = 77.45/x
  3. Step 3: Cross multiply
    320.92x = 481.38 × 77.45
  4. Step 4: Simplify right side
    320.92x = 37,283.54
  5. Step 5: Solve for x
    x = 37,283.54/320.92
  6. Step 6: Final answer
    x = 116.18

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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.