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Finding the Fourth Proportional to 311.08, 429.20 and 245.48

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Solution

The fourth proportional to 311.08, 429.20 and 245.48 is: 338.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.08 : 429.20 = 245.48 : x
  2. Step 2: Convert to fraction form
    311.08/429.20 = 245.48/x
  3. Step 3: Cross multiply
    311.08x = 429.20 × 245.48
  4. Step 4: Simplify right side
    311.08x = 105,360.02
  5. Step 5: Solve for x
    x = 105,360.02/311.08
  6. Step 6: Final answer
    x = 338.69

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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.