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Finding the Fourth Proportional to 997.67, 1,496.07 and 420.14

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Solution

The fourth proportional to 997.67, 1,496.07 and 420.14 is: 630.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    997.67 : 1,496.07 = 420.14 : x
  2. Step 2: Convert to fraction form
    997.67/1,496.07 = 420.14/x
  3. Step 3: Cross multiply
    997.67x = 1,496.07 × 420.14
  4. Step 4: Simplify right side
    997.67x = 628,558.85
  5. Step 5: Solve for x
    x = 628,558.85/997.67
  6. Step 6: Final answer
    x = 630.03

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.