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Finding the Fourth Proportional to 982.80, 1,474.04 and 405.52

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Solution

The fourth proportional to 982.80, 1,474.04 and 405.52 is: 608.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    982.80 : 1,474.04 = 405.52 : x
  2. Step 2: Convert to fraction form
    982.80/1,474.04 = 405.52/x
  3. Step 3: Cross multiply
    982.80x = 1,474.04 × 405.52
  4. Step 4: Simplify right side
    982.80x = 597,752.70
  5. Step 5: Solve for x
    x = 597,752.70/982.80
  6. Step 6: Final answer
    x = 608.21

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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.