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Finding the Fourth Proportional to 655.14, 981.32 and 423.21

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Solution

The fourth proportional to 655.14, 981.32 and 423.21 is: 633.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    655.14 : 981.32 = 423.21 : x
  2. Step 2: Convert to fraction form
    655.14/981.32 = 423.21/x
  3. Step 3: Cross multiply
    655.14x = 981.32 × 423.21
  4. Step 4: Simplify right side
    655.14x = 415,304.44
  5. Step 5: Solve for x
    x = 415,304.44/655.14
  6. Step 6: Final answer
    x = 633.92

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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.