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Finding the Fourth Proportional to 1,320.44, 1,822.97 and 921.92

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Solution

The fourth proportional to 1,320.44, 1,822.97 and 921.92 is: 1,272.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.44 : 1,822.97 = 921.92 : x
  2. Step 2: Convert to fraction form
    1,320.44/1,822.97 = 921.92/x
  3. Step 3: Cross multiply
    1,320.44x = 1,822.97 × 921.92
  4. Step 4: Simplify right side
    1,320.44x = 1,680,625.69
  5. Step 5: Solve for x
    x = 1,680,625.69/1,320.44
  6. Step 6: Final answer
    x = 1,272.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.