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Finding the Fourth Proportional to 247.45, 343.78 and 245.20

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Solution

The fourth proportional to 247.45, 343.78 and 245.20 is: 340.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    247.45 : 343.78 = 245.20 : x
  2. Step 2: Convert to fraction form
    247.45/343.78 = 245.20/x
  3. Step 3: Cross multiply
    247.45x = 343.78 × 245.20
  4. Step 4: Simplify right side
    247.45x = 84,294.86
  5. Step 5: Solve for x
    x = 84,294.86/247.45
  6. Step 6: Final answer
    x = 340.65

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.