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Finding the Fourth Proportional to 987.88, 1,481.73 and 338.54

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Solution

The fourth proportional to 987.88, 1,481.73 and 338.54 is: 507.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.88 : 1,481.73 = 338.54 : x
  2. Step 2: Convert to fraction form
    987.88/1,481.73 = 338.54/x
  3. Step 3: Cross multiply
    987.88x = 1,481.73 × 338.54
  4. Step 4: Simplify right side
    987.88x = 501,624.87
  5. Step 5: Solve for x
    x = 501,624.87/987.88
  6. Step 6: Final answer
    x = 507.78

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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.