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Finding the Fourth Proportional to 422.16, 628.14 and 399.12

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Solution

The fourth proportional to 422.16, 628.14 and 399.12 is: 593.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.16 : 628.14 = 399.12 : x
  2. Step 2: Convert to fraction form
    422.16/628.14 = 399.12/x
  3. Step 3: Cross multiply
    422.16x = 628.14 × 399.12
  4. Step 4: Simplify right side
    422.16x = 250,703.24
  5. Step 5: Solve for x
    x = 250,703.24/422.16
  6. Step 6: Final answer
    x = 593.86

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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.