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Finding the Fourth Proportional to 318.76, 440.06 and 219.32

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Solution

The fourth proportional to 318.76, 440.06 and 219.32 is: 302.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.76 : 440.06 = 219.32 : x
  2. Step 2: Convert to fraction form
    318.76/440.06 = 219.32/x
  3. Step 3: Cross multiply
    318.76x = 440.06 × 219.32
  4. Step 4: Simplify right side
    318.76x = 96,513.96
  5. Step 5: Solve for x
    x = 96,513.96/318.76
  6. Step 6: Final answer
    x = 302.78

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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.