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Finding the Fourth Proportional to 318.32, 439.19 and 304.28

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Solution

The fourth proportional to 318.32, 439.19 and 304.28 is: 419.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.32 : 439.19 = 304.28 : x
  2. Step 2: Convert to fraction form
    318.32/439.19 = 304.28/x
  3. Step 3: Cross multiply
    318.32x = 439.19 × 304.28
  4. Step 4: Simplify right side
    318.32x = 133,635.30
  5. Step 5: Solve for x
    x = 133,635.30/318.32
  6. Step 6: Final answer
    x = 419.81

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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.