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Finding the Fourth Proportional to 553.99, 764.49 and 321.13

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Solution

The fourth proportional to 553.99, 764.49 and 321.13 is: 443.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.99 : 764.49 = 321.13 : x
  2. Step 2: Convert to fraction form
    553.99/764.49 = 321.13/x
  3. Step 3: Cross multiply
    553.99x = 764.49 × 321.13
  4. Step 4: Simplify right side
    553.99x = 245,500.67
  5. Step 5: Solve for x
    x = 245,500.67/553.99
  6. Step 6: Final answer
    x = 443.15

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.