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Finding the Fourth Proportional to 667.26, 999.36 and 644.20

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Solution

The fourth proportional to 667.26, 999.36 and 644.20 is: 964.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.26 : 999.36 = 644.20 : x
  2. Step 2: Convert to fraction form
    667.26/999.36 = 644.20/x
  3. Step 3: Cross multiply
    667.26x = 999.36 × 644.20
  4. Step 4: Simplify right side
    667.26x = 643,787.71
  5. Step 5: Solve for x
    x = 643,787.71/667.26
  6. Step 6: Final answer
    x = 964.82

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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.