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Finding the Fourth Proportional to 1,139.57, 1,709.44 and 409.15

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Solution

The fourth proportional to 1,139.57, 1,709.44 and 409.15 is: 613.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.57 : 1,709.44 = 409.15 : x
  2. Step 2: Convert to fraction form
    1,139.57/1,709.44 = 409.15/x
  3. Step 3: Cross multiply
    1,139.57x = 1,709.44 × 409.15
  4. Step 4: Simplify right side
    1,139.57x = 699,415.33
  5. Step 5: Solve for x
    x = 699,415.33/1,139.57
  6. Step 6: Final answer
    x = 613.76

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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.