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Finding the Fourth Proportional to 318.32, 439.23 and 290.64

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Solution

The fourth proportional to 318.32, 439.23 and 290.64 is: 401.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.32 : 439.23 = 290.64 : x
  2. Step 2: Convert to fraction form
    318.32/439.23 = 290.64/x
  3. Step 3: Cross multiply
    318.32x = 439.23 × 290.64
  4. Step 4: Simplify right side
    318.32x = 127,658.49
  5. Step 5: Solve for x
    x = 127,658.49/318.32
  6. Step 6: Final answer
    x = 401.04

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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.