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Finding the Fourth Proportional to 664.75, 995.10 and 433.90

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Solution

The fourth proportional to 664.75, 995.10 and 433.90 is: 649.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.75 : 995.10 = 433.90 : x
  2. Step 2: Convert to fraction form
    664.75/995.10 = 433.90/x
  3. Step 3: Cross multiply
    664.75x = 995.10 × 433.90
  4. Step 4: Simplify right side
    664.75x = 431,773.89
  5. Step 5: Solve for x
    x = 431,773.89/664.75
  6. Step 6: Final answer
    x = 649.53

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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.