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Finding the Fourth Proportional to 1,687.26, 2,531.37 and 661.98

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Solution

The fourth proportional to 1,687.26, 2,531.37 and 661.98 is: 993.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,687.26 : 2,531.37 = 661.98 : x
  2. Step 2: Convert to fraction form
    1,687.26/2,531.37 = 661.98/x
  3. Step 3: Cross multiply
    1,687.26x = 2,531.37 × 661.98
  4. Step 4: Simplify right side
    1,687.26x = 1,675,716.31
  5. Step 5: Solve for x
    x = 1,675,716.31/1,687.26
  6. Step 6: Final answer
    x = 993.16

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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.