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Finding the Fourth Proportional to 553.98, 764.48 and 305.27

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Solution

The fourth proportional to 553.98, 764.48 and 305.27 is: 421.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.98 : 764.48 = 305.27 : x
  2. Step 2: Convert to fraction form
    553.98/764.48 = 305.27/x
  3. Step 3: Cross multiply
    553.98x = 764.48 × 305.27
  4. Step 4: Simplify right side
    553.98x = 233,375.20
  5. Step 5: Solve for x
    x = 233,375.20/553.98
  6. Step 6: Final answer
    x = 421.27

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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.