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Finding the Fourth Proportional to 403.25, 604.77 and 129.20

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Solution

The fourth proportional to 403.25, 604.77 and 129.20 is: 193.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.25 : 604.77 = 129.20 : x
  2. Step 2: Convert to fraction form
    403.25/604.77 = 129.20/x
  3. Step 3: Cross multiply
    403.25x = 604.77 × 129.20
  4. Step 4: Simplify right side
    403.25x = 78,133.26
  5. Step 5: Solve for x
    x = 78,133.26/403.25
  6. Step 6: Final answer
    x = 193.76

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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.