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Finding the Fourth Proportional to 982.70, 1,474.02 and 381.58

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Solution

The fourth proportional to 982.70, 1,474.02 and 381.58 is: 572.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    982.70 : 1,474.02 = 381.58 : x
  2. Step 2: Convert to fraction form
    982.70/1,474.02 = 381.58/x
  3. Step 3: Cross multiply
    982.70x = 1,474.02 × 381.58
  4. Step 4: Simplify right side
    982.70x = 562,456.55
  5. Step 5: Solve for x
    x = 562,456.55/982.70
  6. Step 6: Final answer
    x = 572.36

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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.