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Finding the Fourth Proportional to 986.09, 1,479.41 and 328.03

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Solution

The fourth proportional to 986.09, 1,479.41 and 328.03 is: 492.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.09 : 1,479.41 = 328.03 : x
  2. Step 2: Convert to fraction form
    986.09/1,479.41 = 328.03/x
  3. Step 3: Cross multiply
    986.09x = 1,479.41 × 328.03
  4. Step 4: Simplify right side
    986.09x = 485,286.75
  5. Step 5: Solve for x
    x = 485,286.75/986.09
  6. Step 6: Final answer
    x = 492.13

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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.