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Finding the Fourth Proportional to 812.23, 1,216.05 and 631.74

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Solution

The fourth proportional to 812.23, 1,216.05 and 631.74 is: 945.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.23 : 1,216.05 = 631.74 : x
  2. Step 2: Convert to fraction form
    812.23/1,216.05 = 631.74/x
  3. Step 3: Cross multiply
    812.23x = 1,216.05 × 631.74
  4. Step 4: Simplify right side
    812.23x = 768,221.35
  5. Step 5: Solve for x
    x = 768,221.35/812.23
  6. Step 6: Final answer
    x = 945.82

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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.