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Finding the Fourth Proportional to 623.92, 936 and 213.16

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Solution

The fourth proportional to 623.92, 936 and 213.16 is: 319.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    623.92 : 936 = 213.16 : x
  2. Step 2: Convert to fraction form
    623.92/936 = 213.16/x
  3. Step 3: Cross multiply
    623.92x = 936 × 213.16
  4. Step 4: Simplify right side
    623.92x = 199,517.76
  5. Step 5: Solve for x
    x = 199,517.76/623.92
  6. Step 6: Final answer
    x = 319.78

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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.