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Finding the Fourth Proportional to 668.72, 995.78 and 644.12

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Solution

The fourth proportional to 668.72, 995.78 and 644.12 is: 959.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.72 : 995.78 = 644.12 : x
  2. Step 2: Convert to fraction form
    668.72/995.78 = 644.12/x
  3. Step 3: Cross multiply
    668.72x = 995.78 × 644.12
  4. Step 4: Simplify right side
    668.72x = 641,398.56
  5. Step 5: Solve for x
    x = 641,398.56/668.72
  6. Step 6: Final answer
    x = 959.14

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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.