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Finding the Fourth Proportional to 403.36, 604.86 and 129.40

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Solution

The fourth proportional to 403.36, 604.86 and 129.40 is: 194.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.36 : 604.86 = 129.40 : x
  2. Step 2: Convert to fraction form
    403.36/604.86 = 129.40/x
  3. Step 3: Cross multiply
    403.36x = 604.86 × 129.40
  4. Step 4: Simplify right side
    403.36x = 78,268.88
  5. Step 5: Solve for x
    x = 78,268.88/403.36
  6. Step 6: Final answer
    x = 194.04

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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.