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Finding the Fourth Proportional to 1,185.38, 1,778.07 and 455.30

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Solution

The fourth proportional to 1,185.38, 1,778.07 and 455.30 is: 682.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,185.38 : 1,778.07 = 455.30 : x
  2. Step 2: Convert to fraction form
    1,185.38/1,778.07 = 455.30/x
  3. Step 3: Cross multiply
    1,185.38x = 1,778.07 × 455.30
  4. Step 4: Simplify right side
    1,185.38x = 809,555.27
  5. Step 5: Solve for x
    x = 809,555.27/1,185.38
  6. Step 6: Final answer
    x = 682.95

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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.