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Finding the Fourth Proportional to 1,139.26, 1,707.80 and 445.38

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Solution

The fourth proportional to 1,139.26, 1,707.80 and 445.38 is: 667.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.26 : 1,707.80 = 445.38 : x
  2. Step 2: Convert to fraction form
    1,139.26/1,707.80 = 445.38/x
  3. Step 3: Cross multiply
    1,139.26x = 1,707.80 × 445.38
  4. Step 4: Simplify right side
    1,139.26x = 760,619.96
  5. Step 5: Solve for x
    x = 760,619.96/1,139.26
  6. Step 6: Final answer
    x = 667.64

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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.