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Finding the Fourth Proportional to 553.67, 764.10 and 320.84

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Solution

The fourth proportional to 553.67, 764.10 and 320.84 is: 442.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.67 : 764.10 = 320.84 : x
  2. Step 2: Convert to fraction form
    553.67/764.10 = 320.84/x
  3. Step 3: Cross multiply
    553.67x = 764.10 × 320.84
  4. Step 4: Simplify right side
    553.67x = 245,150.02
  5. Step 5: Solve for x
    x = 245,150.02/553.67
  6. Step 6: Final answer
    x = 442.78

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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.