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Finding the Fourth Proportional to 1,139.95, 1,709.97 and 409.27

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Solution

The fourth proportional to 1,139.95, 1,709.97 and 409.27 is: 613.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.95 : 1,709.97 = 409.27 : x
  2. Step 2: Convert to fraction form
    1,139.95/1,709.97 = 409.27/x
  3. Step 3: Cross multiply
    1,139.95x = 1,709.97 × 409.27
  4. Step 4: Simplify right side
    1,139.95x = 699,839.42
  5. Step 5: Solve for x
    x = 699,839.42/1,139.95
  6. Step 6: Final answer
    x = 613.92

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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.