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Finding the Fourth Proportional to 421.72, 628.99 and 363.28

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Solution

The fourth proportional to 421.72, 628.99 and 363.28 is: 541.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.72 : 628.99 = 363.28 : x
  2. Step 2: Convert to fraction form
    421.72/628.99 = 363.28/x
  3. Step 3: Cross multiply
    421.72x = 628.99 × 363.28
  4. Step 4: Simplify right side
    421.72x = 228,499.49
  5. Step 5: Solve for x
    x = 228,499.49/421.72
  6. Step 6: Final answer
    x = 541.83

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.