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Finding the Fourth Proportional to 317.97, 439.20 and 245.18

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Solution

The fourth proportional to 317.97, 439.20 and 245.18 is: 338.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.97 : 439.20 = 245.18 : x
  2. Step 2: Convert to fraction form
    317.97/439.20 = 245.18/x
  3. Step 3: Cross multiply
    317.97x = 439.20 × 245.18
  4. Step 4: Simplify right side
    317.97x = 107,680.86
  5. Step 5: Solve for x
    x = 107,680.86/317.97
  6. Step 6: Final answer
    x = 338.65

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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.