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Finding the Fourth Proportional to 553.78, 764.18 and 305.09

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Solution

The fourth proportional to 553.78, 764.18 and 305.09 is: 421.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.78 : 764.18 = 305.09 : x
  2. Step 2: Convert to fraction form
    553.78/764.18 = 305.09/x
  3. Step 3: Cross multiply
    553.78x = 764.18 × 305.09
  4. Step 4: Simplify right side
    553.78x = 233,143.68
  5. Step 5: Solve for x
    x = 233,143.68/553.78
  6. Step 6: Final answer
    x = 421.00

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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.