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Finding the Fourth Proportional to 669.22, 995.89 and 643.30

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Solution

The fourth proportional to 669.22, 995.89 and 643.30 is: 957.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.22 : 995.89 = 643.30 : x
  2. Step 2: Convert to fraction form
    669.22/995.89 = 643.30/x
  3. Step 3: Cross multiply
    669.22x = 995.89 × 643.30
  4. Step 4: Simplify right side
    669.22x = 640,652.82
  5. Step 5: Solve for x
    x = 640,652.82/669.22
  6. Step 6: Final answer
    x = 957.31

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.