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Finding the Fourth Proportional to 486.18, 671.38 and 311.83

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Solution

The fourth proportional to 486.18, 671.38 and 311.83 is: 430.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.18 : 671.38 = 311.83 : x
  2. Step 2: Convert to fraction form
    486.18/671.38 = 311.83/x
  3. Step 3: Cross multiply
    486.18x = 671.38 × 311.83
  4. Step 4: Simplify right side
    486.18x = 209,353.97
  5. Step 5: Solve for x
    x = 209,353.97/486.18
  6. Step 6: Final answer
    x = 430.61

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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.