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Finding the Fourth Proportional to 494.42, 741.64 and 129.21

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Solution

The fourth proportional to 494.42, 741.64 and 129.21 is: 193.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    494.42 : 741.64 = 129.21 : x
  2. Step 2: Convert to fraction form
    494.42/741.64 = 129.21/x
  3. Step 3: Cross multiply
    494.42x = 741.64 × 129.21
  4. Step 4: Simplify right side
    494.42x = 95,826.98
  5. Step 5: Solve for x
    x = 95,826.98/494.42
  6. Step 6: Final answer
    x = 193.82

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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.