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Finding the Fourth Proportional to 664.01, 991.00 and 646.73

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Solution

The fourth proportional to 664.01, 991.00 and 646.73 is: 965.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.01 : 991.00 = 646.73 : x
  2. Step 2: Convert to fraction form
    664.01/991.00 = 646.73/x
  3. Step 3: Cross multiply
    664.01x = 991.00 × 646.73
  4. Step 4: Simplify right side
    664.01x = 640,906.20
  5. Step 5: Solve for x
    x = 640,906.20/664.01
  6. Step 6: Final answer
    x = 965.21

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Double scale
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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.