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Finding the Fourth Proportional to 425.11, 635.90 and 399.19

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Solution

The fourth proportional to 425.11, 635.90 and 399.19 is: 597.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.11 : 635.90 = 399.19 : x
  2. Step 2: Convert to fraction form
    425.11/635.90 = 399.19/x
  3. Step 3: Cross multiply
    425.11x = 635.90 × 399.19
  4. Step 4: Simplify right side
    425.11x = 253,844.92
  5. Step 5: Solve for x
    x = 253,844.92/425.11
  6. Step 6: Final answer
    x = 597.13

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.