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Finding the Fourth Proportional to 671.16, 998.07 and 663.96

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Solution

The fourth proportional to 671.16, 998.07 and 663.96 is: 987.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.16 : 998.07 = 663.96 : x
  2. Step 2: Convert to fraction form
    671.16/998.07 = 663.96/x
  3. Step 3: Cross multiply
    671.16x = 998.07 × 663.96
  4. Step 4: Simplify right side
    671.16x = 662,678.56
  5. Step 5: Solve for x
    x = 662,678.56/671.16
  6. Step 6: Final answer
    x = 987.36

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.