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Finding the Fourth Proportional to 403.34, 605.03 and 129.42

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Solution

The fourth proportional to 403.34, 605.03 and 129.42 is: 194.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.34 : 605.03 = 129.42 : x
  2. Step 2: Convert to fraction form
    403.34/605.03 = 129.42/x
  3. Step 3: Cross multiply
    403.34x = 605.03 × 129.42
  4. Step 4: Simplify right side
    403.34x = 78,302.34
  5. Step 5: Solve for x
    x = 78,302.34/403.34
  6. Step 6: Final answer
    x = 194.14

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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.