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Finding the Fourth Proportional to 1,334.92, 1,999.66 and 1,089

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Solution

The fourth proportional to 1,334.92, 1,999.66 and 1,089 is: 1,631.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,334.92 : 1,999.66 = 1,089 : x
  2. Step 2: Convert to fraction form
    1,334.92/1,999.66 = 1,089/x
  3. Step 3: Cross multiply
    1,334.92x = 1,999.66 × 1,089
  4. Step 4: Simplify right side
    1,334.92x = 2,177,629.74
  5. Step 5: Solve for x
    x = 2,177,629.74/1,334.92
  6. Step 6: Final answer
    x = 1,631.28

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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.