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Finding the Fourth Proportional to 320.99, 481.48 and 158.78

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Solution

The fourth proportional to 320.99, 481.48 and 158.78 is: 238.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.99 : 481.48 = 158.78 : x
  2. Step 2: Convert to fraction form
    320.99/481.48 = 158.78/x
  3. Step 3: Cross multiply
    320.99x = 481.48 × 158.78
  4. Step 4: Simplify right side
    320.99x = 76,450.20
  5. Step 5: Solve for x
    x = 76,450.20/320.99
  6. Step 6: Final answer
    x = 238.17

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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.