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Finding the Fourth Proportional to 1,179.41, 1,769.09 and 686.55

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Solution

The fourth proportional to 1,179.41, 1,769.09 and 686.55 is: 1,029.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,179.41 : 1,769.09 = 686.55 : x
  2. Step 2: Convert to fraction form
    1,179.41/1,769.09 = 686.55/x
  3. Step 3: Cross multiply
    1,179.41x = 1,769.09 × 686.55
  4. Step 4: Simplify right side
    1,179.41x = 1,214,565.31
  5. Step 5: Solve for x
    x = 1,214,565.31/1,179.41
  6. Step 6: Final answer
    x = 1,029.81

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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.