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Finding the Fourth Proportional to 987.46, 1,481.32 and 329.12

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Solution

The fourth proportional to 987.46, 1,481.32 and 329.12 is: 493.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.46 : 1,481.32 = 329.12 : x
  2. Step 2: Convert to fraction form
    987.46/1,481.32 = 329.12/x
  3. Step 3: Cross multiply
    987.46x = 1,481.32 × 329.12
  4. Step 4: Simplify right side
    987.46x = 487,532.04
  5. Step 5: Solve for x
    x = 487,532.04/987.46
  6. Step 6: Final answer
    x = 493.72

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Double scale
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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.