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Finding the Fourth Proportional to 987.57, 1,481.63 and 329.31

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Solution

The fourth proportional to 987.57, 1,481.63 and 329.31 is: 494.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.57 : 1,481.63 = 329.31 : x
  2. Step 2: Convert to fraction form
    987.57/1,481.63 = 329.31/x
  3. Step 3: Cross multiply
    987.57x = 1,481.63 × 329.31
  4. Step 4: Simplify right side
    987.57x = 487,913.93
  5. Step 5: Solve for x
    x = 487,913.93/987.57
  6. Step 6: Final answer
    x = 494.06

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1.5x scale

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.