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Finding the Fourth Proportional to 318.16, 439.07 and 200.15

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Solution

The fourth proportional to 318.16, 439.07 and 200.15 is: 276.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.16 : 439.07 = 200.15 : x
  2. Step 2: Convert to fraction form
    318.16/439.07 = 200.15/x
  3. Step 3: Cross multiply
    318.16x = 439.07 × 200.15
  4. Step 4: Simplify right side
    318.16x = 87,879.86
  5. Step 5: Solve for x
    x = 87,879.86/318.16
  6. Step 6: Final answer
    x = 276.21

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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.