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Finding the Fourth Proportional to 494.30, 682.20 and 317.40

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Solution

The fourth proportional to 494.30, 682.20 and 317.40 is: 438.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    494.30 : 682.20 = 317.40 : x
  2. Step 2: Convert to fraction form
    494.30/682.20 = 317.40/x
  3. Step 3: Cross multiply
    494.30x = 682.20 × 317.40
  4. Step 4: Simplify right side
    494.30x = 216,530.28
  5. Step 5: Solve for x
    x = 216,530.28/494.30
  6. Step 6: Final answer
    x = 438.06

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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.