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Finding the Fourth Proportional to 1,139.35, 1,707.99 and 408.75

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Solution

The fourth proportional to 1,139.35, 1,707.99 and 408.75 is: 612.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.35 : 1,707.99 = 408.75 : x
  2. Step 2: Convert to fraction form
    1,139.35/1,707.99 = 408.75/x
  3. Step 3: Cross multiply
    1,139.35x = 1,707.99 × 408.75
  4. Step 4: Simplify right side
    1,139.35x = 698,146.03
  5. Step 5: Solve for x
    x = 698,146.03/1,139.35
  6. Step 6: Final answer
    x = 612.76

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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.