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Finding the Fourth Proportional to 1,395.43, 2,092.11 and 665.52

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Solution

The fourth proportional to 1,395.43, 2,092.11 and 665.52 is: 997.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,395.43 : 2,092.11 = 665.52 : x
  2. Step 2: Convert to fraction form
    1,395.43/2,092.11 = 665.52/x
  3. Step 3: Cross multiply
    1,395.43x = 2,092.11 × 665.52
  4. Step 4: Simplify right side
    1,395.43x = 1,392,334.45
  5. Step 5: Solve for x
    x = 1,392,334.45/1,395.43
  6. Step 6: Final answer
    x = 997.78

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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.