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Finding the Fourth Proportional to 320.84, 481.21 and 89.75

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Solution

The fourth proportional to 320.84, 481.21 and 89.75 is: 134.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.84 : 481.21 = 89.75 : x
  2. Step 2: Convert to fraction form
    320.84/481.21 = 89.75/x
  3. Step 3: Cross multiply
    320.84x = 481.21 × 89.75
  4. Step 4: Simplify right side
    320.84x = 43,189.58
  5. Step 5: Solve for x
    x = 43,189.58/320.84
  6. Step 6: Final answer
    x = 134.61

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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.