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Finding the Fourth Proportional to 494.91, 682.96 and 317.69

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Solution

The fourth proportional to 494.91, 682.96 and 317.69 is: 438.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    494.91 : 682.96 = 317.69 : x
  2. Step 2: Convert to fraction form
    494.91/682.96 = 317.69/x
  3. Step 3: Cross multiply
    494.91x = 682.96 × 317.69
  4. Step 4: Simplify right side
    494.91x = 216,969.56
  5. Step 5: Solve for x
    x = 216,969.56/494.91
  6. Step 6: Final answer
    x = 438.40

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.