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Finding the Fourth Proportional to 320.68, 481.02 and 77.20

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Solution

The fourth proportional to 320.68, 481.02 and 77.20 is: 115.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.68 : 481.02 = 77.20 : x
  2. Step 2: Convert to fraction form
    320.68/481.02 = 77.20/x
  3. Step 3: Cross multiply
    320.68x = 481.02 × 77.20
  4. Step 4: Simplify right side
    320.68x = 37,135.98
  5. Step 5: Solve for x
    x = 37,135.98/320.68
  6. Step 6: Final answer
    x = 115.80

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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.