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Finding the Fourth Proportional to 1,328.09, 1,991.70 and 483.66

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Solution

The fourth proportional to 1,328.09, 1,991.70 and 483.66 is: 725.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,328.09 : 1,991.70 = 483.66 : x
  2. Step 2: Convert to fraction form
    1,328.09/1,991.70 = 483.66/x
  3. Step 3: Cross multiply
    1,328.09x = 1,991.70 × 483.66
  4. Step 4: Simplify right side
    1,328.09x = 963,305.62
  5. Step 5: Solve for x
    x = 963,305.62/1,328.09
  6. Step 6: Final answer
    x = 725.33

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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.