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Finding the Fourth Proportional to 655.11, 982.46 and 290.21

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Solution

The fourth proportional to 655.11, 982.46 and 290.21 is: 435.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    655.11 : 982.46 = 290.21 : x
  2. Step 2: Convert to fraction form
    655.11/982.46 = 290.21/x
  3. Step 3: Cross multiply
    655.11x = 982.46 × 290.21
  4. Step 4: Simplify right side
    655.11x = 285,119.72
  5. Step 5: Solve for x
    x = 285,119.72/655.11
  6. Step 6: Final answer
    x = 435.22

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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.