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Finding the Fourth Proportional to 1,147.26, 1,721.40 and 685.98

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Solution

The fourth proportional to 1,147.26, 1,721.40 and 685.98 is: 1,029.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,147.26 : 1,721.40 = 685.98 : x
  2. Step 2: Convert to fraction form
    1,147.26/1,721.40 = 685.98/x
  3. Step 3: Cross multiply
    1,147.26x = 1,721.40 × 685.98
  4. Step 4: Simplify right side
    1,147.26x = 1,180,845.97
  5. Step 5: Solve for x
    x = 1,180,845.97/1,147.26
  6. Step 6: Final answer
    x = 1,029.27

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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.