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Finding the Fourth Proportional to 997.42, 1,375.83 and 718.03

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Solution

The fourth proportional to 997.42, 1,375.83 and 718.03 is: 990.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    997.42 : 1,375.83 = 718.03 : x
  2. Step 2: Convert to fraction form
    997.42/1,375.83 = 718.03/x
  3. Step 3: Cross multiply
    997.42x = 1,375.83 × 718.03
  4. Step 4: Simplify right side
    997.42x = 987,887.21
  5. Step 5: Solve for x
    x = 987,887.21/997.42
  6. Step 6: Final answer
    x = 990.44

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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.