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Finding the Fourth Proportional to 494.11, 741.11 and 128.89

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Solution

The fourth proportional to 494.11, 741.11 and 128.89 is: 193.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    494.11 : 741.11 = 128.89 : x
  2. Step 2: Convert to fraction form
    494.11/741.11 = 128.89/x
  3. Step 3: Cross multiply
    494.11x = 741.11 × 128.89
  4. Step 4: Simplify right side
    494.11x = 95,517.96
  5. Step 5: Solve for x
    x = 95,517.96/494.11
  6. Step 6: Final answer
    x = 193.32

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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.