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Finding the Fourth Proportional to 669.43, 925.41 and 663.22

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Solution

The fourth proportional to 669.43, 925.41 and 663.22 is: 916.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.43 : 925.41 = 663.22 : x
  2. Step 2: Convert to fraction form
    669.43/925.41 = 663.22/x
  3. Step 3: Cross multiply
    669.43x = 925.41 × 663.22
  4. Step 4: Simplify right side
    669.43x = 613,750.42
  5. Step 5: Solve for x
    x = 613,750.42/669.43
  6. Step 6: Final answer
    x = 916.83

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.