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Finding the Fourth Proportional to 667.56, 999.90 and 423.48

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Solution

The fourth proportional to 667.56, 999.90 and 423.48 is: 634.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.56 : 999.90 = 423.48 : x
  2. Step 2: Convert to fraction form
    667.56/999.90 = 423.48/x
  3. Step 3: Cross multiply
    667.56x = 999.90 × 423.48
  4. Step 4: Simplify right side
    667.56x = 423,437.65
  5. Step 5: Solve for x
    x = 423,437.65/667.56
  6. Step 6: Final answer
    x = 634.31

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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.