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Finding the Fourth Proportional to 1,138.94, 1,707.19 and 408.04

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Solution

The fourth proportional to 1,138.94, 1,707.19 and 408.04 is: 611.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.94 : 1,707.19 = 408.04 : x
  2. Step 2: Convert to fraction form
    1,138.94/1,707.19 = 408.04/x
  3. Step 3: Cross multiply
    1,138.94x = 1,707.19 × 408.04
  4. Step 4: Simplify right side
    1,138.94x = 696,601.81
  5. Step 5: Solve for x
    x = 696,601.81/1,138.94
  6. Step 6: Final answer
    x = 611.62

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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.