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Finding the Fourth Proportional to 403.79, 605.60 and 111.21

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Solution

The fourth proportional to 403.79, 605.60 and 111.21 is: 166.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.79 : 605.60 = 111.21 : x
  2. Step 2: Convert to fraction form
    403.79/605.60 = 111.21/x
  3. Step 3: Cross multiply
    403.79x = 605.60 × 111.21
  4. Step 4: Simplify right side
    403.79x = 67,351.53
  5. Step 5: Solve for x
    x = 67,351.53/403.79
  6. Step 6: Final answer
    x = 166.80

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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.