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Finding the Fourth Proportional to 1,139.05, 1,708.57 and 408.68

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Solution

The fourth proportional to 1,139.05, 1,708.57 and 408.68 is: 613.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.05 : 1,708.57 = 408.68 : x
  2. Step 2: Convert to fraction form
    1,139.05/1,708.57 = 408.68/x
  3. Step 3: Cross multiply
    1,139.05x = 1,708.57 × 408.68
  4. Step 4: Simplify right side
    1,139.05x = 698,248.82
  5. Step 5: Solve for x
    x = 698,248.82/1,139.05
  6. Step 6: Final answer
    x = 613.01

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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.