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Finding the Fourth Proportional to 1,139.19, 1,709.08 and 408.84

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Solution

The fourth proportional to 1,139.19, 1,709.08 and 408.84 is: 613.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.19 : 1,709.08 = 408.84 : x
  2. Step 2: Convert to fraction form
    1,139.19/1,709.08 = 408.84/x
  3. Step 3: Cross multiply
    1,139.19x = 1,709.08 × 408.84
  4. Step 4: Simplify right side
    1,139.19x = 698,740.27
  5. Step 5: Solve for x
    x = 698,740.27/1,139.19
  6. Step 6: Final answer
    x = 613.37

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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.