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Finding the Fourth Proportional to 415.18, 620.92 and 311.32

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Solution

The fourth proportional to 415.18, 620.92 and 311.32 is: 465.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.18 : 620.92 = 311.32 : x
  2. Step 2: Convert to fraction form
    415.18/620.92 = 311.32/x
  3. Step 3: Cross multiply
    415.18x = 620.92 × 311.32
  4. Step 4: Simplify right side
    415.18x = 193,304.81
  5. Step 5: Solve for x
    x = 193,304.81/415.18
  6. Step 6: Final answer
    x = 465.59

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.