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Finding the Fourth Proportional to 667.13, 999.78 and 423.22

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Solution

The fourth proportional to 667.13, 999.78 and 423.22 is: 634.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.13 : 999.78 = 423.22 : x
  2. Step 2: Convert to fraction form
    667.13/999.78 = 423.22/x
  3. Step 3: Cross multiply
    667.13x = 999.78 × 423.22
  4. Step 4: Simplify right side
    667.13x = 423,125.98
  5. Step 5: Solve for x
    x = 423,125.98/667.13
  6. Step 6: Final answer
    x = 634.25

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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.