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Finding the Fourth Proportional to 416.35, 573.91 and 311.86

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Solution

The fourth proportional to 416.35, 573.91 and 311.86 is: 429.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    416.35 : 573.91 = 311.86 : x
  2. Step 2: Convert to fraction form
    416.35/573.91 = 311.86/x
  3. Step 3: Cross multiply
    416.35x = 573.91 × 311.86
  4. Step 4: Simplify right side
    416.35x = 178,979.57
  5. Step 5: Solve for x
    x = 178,979.57/416.35
  6. Step 6: Final answer
    x = 429.88

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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.