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Finding the Fourth Proportional to 318.64, 440.14 and 245.86

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Solution

The fourth proportional to 318.64, 440.14 and 245.86 is: 339.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.64 : 440.14 = 245.86 : x
  2. Step 2: Convert to fraction form
    318.64/440.14 = 245.86/x
  3. Step 3: Cross multiply
    318.64x = 440.14 × 245.86
  4. Step 4: Simplify right side
    318.64x = 108,212.82
  5. Step 5: Solve for x
    x = 108,212.82/318.64
  6. Step 6: Final answer
    x = 339.61

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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.