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Finding the Fourth Proportional to 403.84, 605.75 and 129.90

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Solution

The fourth proportional to 403.84, 605.75 and 129.90 is: 194.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.84 : 605.75 = 129.90 : x
  2. Step 2: Convert to fraction form
    403.84/605.75 = 129.90/x
  3. Step 3: Cross multiply
    403.84x = 605.75 × 129.90
  4. Step 4: Simplify right side
    403.84x = 78,688.55
  5. Step 5: Solve for x
    x = 78,688.55/403.84
  6. Step 6: Final answer
    x = 194.85

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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.