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Finding the Fourth Proportional to 553.73, 764.20 and 305.10

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Solution

The fourth proportional to 553.73, 764.20 and 305.10 is: 421.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.73 : 764.20 = 305.10 : x
  2. Step 2: Convert to fraction form
    553.73/764.20 = 305.10/x
  3. Step 3: Cross multiply
    553.73x = 764.20 × 305.10
  4. Step 4: Simplify right side
    553.73x = 233,157.42
  5. Step 5: Solve for x
    x = 233,157.42/553.73
  6. Step 6: Final answer
    x = 421.07

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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.