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Finding the Fourth Proportional to 982.78, 1,355.96 and 633.66

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Solution

The fourth proportional to 982.78, 1,355.96 and 633.66 is: 874.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    982.78 : 1,355.96 = 633.66 : x
  2. Step 2: Convert to fraction form
    982.78/1,355.96 = 633.66/x
  3. Step 3: Cross multiply
    982.78x = 1,355.96 × 633.66
  4. Step 4: Simplify right side
    982.78x = 859,217.61
  5. Step 5: Solve for x
    x = 859,217.61/982.78
  6. Step 6: Final answer
    x = 874.27

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.