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Finding the Fourth Proportional to 1,977.77, 2,728.94 and 1,191.86

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Solution

The fourth proportional to 1,977.77, 2,728.94 and 1,191.86 is: 1,644.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,977.77 : 2,728.94 = 1,191.86 : x
  2. Step 2: Convert to fraction form
    1,977.77/2,728.94 = 1,191.86/x
  3. Step 3: Cross multiply
    1,977.77x = 2,728.94 × 1,191.86
  4. Step 4: Simplify right side
    1,977.77x = 3,252,508.47
  5. Step 5: Solve for x
    x = 3,252,508.47/1,977.77
  6. Step 6: Final answer
    x = 1,644.53

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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.