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Finding the Fourth Proportional to 494.98, 682.73 and 317.64

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Solution

The fourth proportional to 494.98, 682.73 and 317.64 is: 438.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    494.98 : 682.73 = 317.64 : x
  2. Step 2: Convert to fraction form
    494.98/682.73 = 317.64/x
  3. Step 3: Cross multiply
    494.98x = 682.73 × 317.64
  4. Step 4: Simplify right side
    494.98x = 216,860.77
  5. Step 5: Solve for x
    x = 216,860.77/494.98
  6. Step 6: Final answer
    x = 438.12

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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.