Home / 1,687.70-2,531.90-517.64

Finding the Fourth Proportional to 1,687.70, 2,531.90 and 517.64

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Solution

The fourth proportional to 1,687.70, 2,531.90 and 517.64 is: 776.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,687.70 : 2,531.90 = 517.64 : x
  2. Step 2: Convert to fraction form
    1,687.70/2,531.90 = 517.64/x
  3. Step 3: Cross multiply
    1,687.70x = 2,531.90 × 517.64
  4. Step 4: Simplify right side
    1,687.70x = 1,310,601.35
  5. Step 5: Solve for x
    x = 1,310,601.35/1,687.70
  6. Step 6: Final answer
    x = 776.56

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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.