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Finding the Fourth Proportional to 1,687.26, 2,531.62 and 906.35

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Solution

The fourth proportional to 1,687.26, 2,531.62 and 906.35 is: 1,359.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,687.26 : 2,531.62 = 906.35 : x
  2. Step 2: Convert to fraction form
    1,687.26/2,531.62 = 906.35/x
  3. Step 3: Cross multiply
    1,687.26x = 2,531.62 × 906.35
  4. Step 4: Simplify right side
    1,687.26x = 2,294,529.49
  5. Step 5: Solve for x
    x = 2,294,529.49/1,687.26
  6. Step 6: Final answer
    x = 1,359.92

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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.