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Finding the Fourth Proportional to 996.92, 1,375.91 and 718.08

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Solution

The fourth proportional to 996.92, 1,375.91 and 718.08 is: 991.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    996.92 : 1,375.91 = 718.08 : x
  2. Step 2: Convert to fraction form
    996.92/1,375.91 = 718.08/x
  3. Step 3: Cross multiply
    996.92x = 1,375.91 × 718.08
  4. Step 4: Simplify right side
    996.92x = 988,009.86
  5. Step 5: Solve for x
    x = 988,009.86/996.92
  6. Step 6: Final answer
    x = 991.06

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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.