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Finding the Fourth Proportional to 428.11, 644.66 and 363.34

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Solution

The fourth proportional to 428.11, 644.66 and 363.34 is: 547.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.11 : 644.66 = 363.34 : x
  2. Step 2: Convert to fraction form
    428.11/644.66 = 363.34/x
  3. Step 3: Cross multiply
    428.11x = 644.66 × 363.34
  4. Step 4: Simplify right side
    428.11x = 234,228.95
  5. Step 5: Solve for x
    x = 234,228.95/428.11
  6. Step 6: Final answer
    x = 547.12

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.