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Finding the Fourth Proportional to 1,328.09, 1,991.79 and 506.12

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Solution

The fourth proportional to 1,328.09, 1,991.79 and 506.12 is: 759.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,328.09 : 1,991.79 = 506.12 : x
  2. Step 2: Convert to fraction form
    1,328.09/1,991.79 = 506.12/x
  3. Step 3: Cross multiply
    1,328.09x = 1,991.79 × 506.12
  4. Step 4: Simplify right side
    1,328.09x = 1,008,074.80
  5. Step 5: Solve for x
    x = 1,008,074.80/1,328.09
  6. Step 6: Final answer
    x = 759.04

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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.