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Finding the Fourth Proportional to 987.63, 1,481.51 and 329.48

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Solution

The fourth proportional to 987.63, 1,481.51 and 329.48 is: 494.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.63 : 1,481.51 = 329.48 : x
  2. Step 2: Convert to fraction form
    987.63/1,481.51 = 329.48/x
  3. Step 3: Cross multiply
    987.63x = 1,481.51 × 329.48
  4. Step 4: Simplify right side
    987.63x = 488,132.44
  5. Step 5: Solve for x
    x = 488,132.44/987.63
  6. Step 6: Final answer
    x = 494.25

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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.