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Finding the Fourth Proportional to 664.68, 997.80 and 661.71

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Solution

The fourth proportional to 664.68, 997.80 and 661.71 is: 993.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.68 : 997.80 = 661.71 : x
  2. Step 2: Convert to fraction form
    664.68/997.80 = 661.71/x
  3. Step 3: Cross multiply
    664.68x = 997.80 × 661.71
  4. Step 4: Simplify right side
    664.68x = 660,254.24
  5. Step 5: Solve for x
    x = 660,254.24/664.68
  6. Step 6: Final answer
    x = 993.34

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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.