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Finding the Fourth Proportional to 1,328.36, 1,991.02 and 660.92

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Solution

The fourth proportional to 1,328.36, 1,991.02 and 660.92 is: 990.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,328.36 : 1,991.02 = 660.92 : x
  2. Step 2: Convert to fraction form
    1,328.36/1,991.02 = 660.92/x
  3. Step 3: Cross multiply
    1,328.36x = 1,991.02 × 660.92
  4. Step 4: Simplify right side
    1,328.36x = 1,315,904.94
  5. Step 5: Solve for x
    x = 1,315,904.94/1,328.36
  6. Step 6: Final answer
    x = 990.62

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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.