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Finding the Fourth Proportional to 318.56, 439.40 and 245.08

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Solution

The fourth proportional to 318.56, 439.40 and 245.08 is: 338.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.56 : 439.40 = 245.08 : x
  2. Step 2: Convert to fraction form
    318.56/439.40 = 245.08/x
  3. Step 3: Cross multiply
    318.56x = 439.40 × 245.08
  4. Step 4: Simplify right side
    318.56x = 107,688.15
  5. Step 5: Solve for x
    x = 107,688.15/318.56
  6. Step 6: Final answer
    x = 338.05

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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.