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Finding the Fourth Proportional to 666.96, 997.96 and 431.88

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Solution

The fourth proportional to 666.96, 997.96 and 431.88 is: 646.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.96 : 997.96 = 431.88 : x
  2. Step 2: Convert to fraction form
    666.96/997.96 = 431.88/x
  3. Step 3: Cross multiply
    666.96x = 997.96 × 431.88
  4. Step 4: Simplify right side
    666.96x = 430,998.96
  5. Step 5: Solve for x
    x = 430,998.96/666.96
  6. Step 6: Final answer
    x = 646.21

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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.