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Finding the Fourth Proportional to 1,961.77, 2,942.57 and 728.63

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Solution

The fourth proportional to 1,961.77, 2,942.57 and 728.63 is: 1,092.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,961.77 : 2,942.57 = 728.63 : x
  2. Step 2: Convert to fraction form
    1,961.77/2,942.57 = 728.63/x
  3. Step 3: Cross multiply
    1,961.77x = 2,942.57 × 728.63
  4. Step 4: Simplify right side
    1,961.77x = 2,144,044.78
  5. Step 5: Solve for x
    x = 2,144,044.78/1,961.77
  6. Step 6: Final answer
    x = 1,092.91

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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.