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Finding the Fourth Proportional to 319.60, 440.70 and 245.76

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Solution

The fourth proportional to 319.60, 440.70 and 245.76 is: 338.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.60 : 440.70 = 245.76 : x
  2. Step 2: Convert to fraction form
    319.60/440.70 = 245.76/x
  3. Step 3: Cross multiply
    319.60x = 440.70 × 245.76
  4. Step 4: Simplify right side
    319.60x = 108,306.43
  5. Step 5: Solve for x
    x = 108,306.43/319.60
  6. Step 6: Final answer
    x = 338.88

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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.