Home / 1,687.69-2,531.87-517.75

Finding the Fourth Proportional to 1,687.69, 2,531.87 and 517.75

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Solution

The fourth proportional to 1,687.69, 2,531.87 and 517.75 is: 776.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,687.69 : 2,531.87 = 517.75 : x
  2. Step 2: Convert to fraction form
    1,687.69/2,531.87 = 517.75/x
  3. Step 3: Cross multiply
    1,687.69x = 2,531.87 × 517.75
  4. Step 4: Simplify right side
    1,687.69x = 1,310,875.69
  5. Step 5: Solve for x
    x = 1,310,875.69/1,687.69
  6. Step 6: Final answer
    x = 776.73

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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.