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Finding the Fourth Proportional to 982.80, 1,474.16 and 434.84

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Solution

The fourth proportional to 982.80, 1,474.16 and 434.84 is: 652.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    982.80 : 1,474.16 = 434.84 : x
  2. Step 2: Convert to fraction form
    982.80/1,474.16 = 434.84/x
  3. Step 3: Cross multiply
    982.80x = 1,474.16 × 434.84
  4. Step 4: Simplify right side
    982.80x = 641,023.73
  5. Step 5: Solve for x
    x = 641,023.73/982.80
  6. Step 6: Final answer
    x = 652.24

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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.