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Finding the Fourth Proportional to 1,687.56, 2,531.17 and 1,069.39

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Solution

The fourth proportional to 1,687.56, 2,531.17 and 1,069.39 is: 1,603.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,687.56 : 2,531.17 = 1,069.39 : x
  2. Step 2: Convert to fraction form
    1,687.56/2,531.17 = 1,069.39/x
  3. Step 3: Cross multiply
    1,687.56x = 2,531.17 × 1,069.39
  4. Step 4: Simplify right side
    1,687.56x = 2,706,807.89
  5. Step 5: Solve for x
    x = 2,706,807.89/1,687.56
  6. Step 6: Final answer
    x = 1,603.98

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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.