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Finding the Fourth Proportional to 982.55, 1,474.49 and 405.43

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Solution

The fourth proportional to 982.55, 1,474.49 and 405.43 is: 608.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    982.55 : 1,474.49 = 405.43 : x
  2. Step 2: Convert to fraction form
    982.55/1,474.49 = 405.43/x
  3. Step 3: Cross multiply
    982.55x = 1,474.49 × 405.43
  4. Step 4: Simplify right side
    982.55x = 597,799.81
  5. Step 5: Solve for x
    x = 597,799.81/982.55
  6. Step 6: Final answer
    x = 608.42

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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.