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Finding the Fourth Proportional to 1,331.06, 1,998.43 and 919.18

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Solution

The fourth proportional to 1,331.06, 1,998.43 and 919.18 is: 1,380.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,331.06 : 1,998.43 = 919.18 : x
  2. Step 2: Convert to fraction form
    1,331.06/1,998.43 = 919.18/x
  3. Step 3: Cross multiply
    1,331.06x = 1,998.43 × 919.18
  4. Step 4: Simplify right side
    1,331.06x = 1,836,916.89
  5. Step 5: Solve for x
    x = 1,836,916.89/1,331.06
  6. Step 6: Final answer
    x = 1,380.04

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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.