Home / 1,687.88-2,531.81-517.83

Finding the Fourth Proportional to 1,687.88, 2,531.81 and 517.83

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Solution

The fourth proportional to 1,687.88, 2,531.81 and 517.83 is: 776.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,687.88 : 2,531.81 = 517.83 : x
  2. Step 2: Convert to fraction form
    1,687.88/2,531.81 = 517.83/x
  3. Step 3: Cross multiply
    1,687.88x = 2,531.81 × 517.83
  4. Step 4: Simplify right side
    1,687.88x = 1,311,047.17
  5. Step 5: Solve for x
    x = 1,311,047.17/1,687.88
  6. Step 6: Final answer
    x = 776.74

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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.