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Finding the Fourth Proportional to 664.77, 997.16 and 421.37

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Solution

The fourth proportional to 664.77, 997.16 and 421.37 is: 632.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.77 : 997.16 = 421.37 : x
  2. Step 2: Convert to fraction form
    664.77/997.16 = 421.37/x
  3. Step 3: Cross multiply
    664.77x = 997.16 × 421.37
  4. Step 4: Simplify right side
    664.77x = 420,166.22
  5. Step 5: Solve for x
    x = 420,166.22/664.77
  6. Step 6: Final answer
    x = 632.05

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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.