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Finding the Fourth Proportional to 403.32, 605 and 129.44

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Solution

The fourth proportional to 403.32, 605 and 129.44 is: 194.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.32 : 605 = 129.44 : x
  2. Step 2: Convert to fraction form
    403.32/605 = 129.44/x
  3. Step 3: Cross multiply
    403.32x = 605 × 129.44
  4. Step 4: Simplify right side
    403.32x = 78,311.20
  5. Step 5: Solve for x
    x = 78,311.20/403.32
  6. Step 6: Final answer
    x = 194.17

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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.