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Finding the Fourth Proportional to 667.68, 996.12 and 631.20

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Solution

The fourth proportional to 667.68, 996.12 and 631.20 is: 941.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.68 : 996.12 = 631.20 : x
  2. Step 2: Convert to fraction form
    667.68/996.12 = 631.20/x
  3. Step 3: Cross multiply
    667.68x = 996.12 × 631.20
  4. Step 4: Simplify right side
    667.68x = 628,750.94
  5. Step 5: Solve for x
    x = 628,750.94/667.68
  6. Step 6: Final answer
    x = 941.70

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.