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Finding the Fourth Proportional to 965.92, 1,331.76 and 717.88

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Solution

The fourth proportional to 965.92, 1,331.76 and 717.88 is: 989.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    965.92 : 1,331.76 = 717.88 : x
  2. Step 2: Convert to fraction form
    965.92/1,331.76 = 717.88/x
  3. Step 3: Cross multiply
    965.92x = 1,331.76 × 717.88
  4. Step 4: Simplify right side
    965.92x = 956,043.87
  5. Step 5: Solve for x
    x = 956,043.87/965.92
  6. Step 6: Final answer
    x = 989.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.