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Finding the Fourth Proportional to 1,138.90, 1,707.71 and 445.08

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Solution

The fourth proportional to 1,138.90, 1,707.71 and 445.08 is: 667.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.90 : 1,707.71 = 445.08 : x
  2. Step 2: Convert to fraction form
    1,138.90/1,707.71 = 445.08/x
  3. Step 3: Cross multiply
    1,138.90x = 1,707.71 × 445.08
  4. Step 4: Simplify right side
    1,138.90x = 760,067.57
  5. Step 5: Solve for x
    x = 760,067.57/1,138.90
  6. Step 6: Final answer
    x = 667.37

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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.