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Finding the Fourth Proportional to 319.89, 441.51 and 245.40

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Solution

The fourth proportional to 319.89, 441.51 and 245.40 is: 338.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.89 : 441.51 = 245.40 : x
  2. Step 2: Convert to fraction form
    319.89/441.51 = 245.40/x
  3. Step 3: Cross multiply
    319.89x = 441.51 × 245.40
  4. Step 4: Simplify right side
    319.89x = 108,346.55
  5. Step 5: Solve for x
    x = 108,346.55/319.89
  6. Step 6: Final answer
    x = 338.70

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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.