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Finding the Fourth Proportional to 1,139.58, 1,708.84 and 408.96

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Solution

The fourth proportional to 1,139.58, 1,708.84 and 408.96 is: 613.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.58 : 1,708.84 = 408.96 : x
  2. Step 2: Convert to fraction form
    1,139.58/1,708.84 = 408.96/x
  3. Step 3: Cross multiply
    1,139.58x = 1,708.84 × 408.96
  4. Step 4: Simplify right side
    1,139.58x = 698,847.21
  5. Step 5: Solve for x
    x = 698,847.21/1,139.58
  6. Step 6: Final answer
    x = 613.25

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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.