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Finding the Fourth Proportional to 1,777.90, 2,668.86 and 1,129

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Solution

The fourth proportional to 1,777.90, 2,668.86 and 1,129 is: 1,694.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,777.90 : 2,668.86 = 1,129 : x
  2. Step 2: Convert to fraction form
    1,777.90/2,668.86 = 1,129/x
  3. Step 3: Cross multiply
    1,777.90x = 2,668.86 × 1,129
  4. Step 4: Simplify right side
    1,777.90x = 3,013,142.94
  5. Step 5: Solve for x
    x = 3,013,142.94/1,777.90
  6. Step 6: Final answer
    x = 1,694.78

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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.