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Finding the Fourth Proportional to 997.29, 1,375.66 and 643.09

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Solution

The fourth proportional to 997.29, 1,375.66 and 643.09 is: 887.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    997.29 : 1,375.66 = 643.09 : x
  2. Step 2: Convert to fraction form
    997.29/1,375.66 = 643.09/x
  3. Step 3: Cross multiply
    997.29x = 1,375.66 × 643.09
  4. Step 4: Simplify right side
    997.29x = 884,671.32
  5. Step 5: Solve for x
    x = 884,671.32/997.29
  6. Step 6: Final answer
    x = 887.08

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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.