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Finding the Fourth Proportional to 669.64, 1,003.36 and 644.36

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Solution

The fourth proportional to 669.64, 1,003.36 and 644.36 is: 965.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.64 : 1,003.36 = 644.36 : x
  2. Step 2: Convert to fraction form
    669.64/1,003.36 = 644.36/x
  3. Step 3: Cross multiply
    669.64x = 1,003.36 × 644.36
  4. Step 4: Simplify right side
    669.64x = 646,525.05
  5. Step 5: Solve for x
    x = 646,525.05/669.64
  6. Step 6: Final answer
    x = 965.48

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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.